How to reuse parts of WordPress site e.g. header, footer, part of header for multiple WordPress sites?

I would think that your best bet is option 3 (multisite) if possible. Once you’ve got your network of sites set up you can then specify which menu to use as described here.

Doing the other solutions (a more rough and ready ‘hardcoded’ approach) will almost certainly give you headaches in the future. Having multisite set up also has advantages such as ease of updating and maintenance of user base.

You’re right that if you use a multisite setup, all sites use one database. You shouldn’t lose any data in the handover, but you should definitely do a complete backup first in case. If you’re worried, do a dry run by setting up a testing environment and exporting / importing the data using Tools > Export / Import.

Related Posts:

  1. Solutions for generating dynamic javascript / CSS
  2. Auto get_header and get_footer on every template?
  3. Any alternate TinyMCE4 themes / subthemes?
  4. Whats the safest way to output custom JavaScript and Css code entered by the admin in the Theme Settings?
  5. How can a Theme Contain no Header File or Footer File?
  6. How do the default themes reference style.css?
  7. How to add material design css in wordpress and woocommerce
  8. WordPress Unite Theme: Footer isn’t sticking [closed]
  9. How to get javascript slider to work! [closed]
  10. How to change footer or for different kinds of users in wordpress?
  11. How can I wrap all blog posts image with
  12. White screen when attaching css to function.php
  13. WordPress theme resource won’t load over VPN
  14. theme-independent CSS/JS files
  15. Changing footer depending on URL (poli language site)
  16. header, stylesheet not being read
  17. What is The Best Way to Make Parallax header effect for wordpress theme ?? pure CSS or using JavaScript? [closed]
  18. Does the functions.php file ever get called during an AJAX call? Debug AJAX
  19. How important is it to enqueue a theme’s stylesheet?
  20. Enqueue a stylesheet for login page and make it appear in head element
  21. Generating CSS Files Dynamically Using PHP Scripts?
  22. Understanding wp_add_inline_style
  23. Hide a div that is part of all pages on one specific page
  24. Why I can’t add a CSS style in this WordPress theme?
  25. Can’t get staging site to display same way as live site. Completely stumped
  26. Editing the custom background CSS
  27. How can I get wp_head() as a string instead of echoing it?
  28. add generated stylesheet from parent theme after child-themes style.css
  29. How to Handle CSS for Multiple Header header.php Files?
  30. Changing the entire control choices using wp.customize with JavaScript
  31. Modifying JS files in Child-theme
  32. Convert a static website to a WordPress theme and import all existing content
  33. Custom CSS In Uploads Folder
  34. There’s an image named g.gif somewhere in my WordPress site
  35. How to highlight the current page in the nav menu?
  36. Add social icons in a theme through custom admin menu
  37. Root Sage theme styles are not working!
  38. Modify the Additional CSS section (adding a disclaimer)
  39. How to configure wordpress to work with Vuejs with SSR and without hashbang
  40. Sub folder CSS that’s read by Admin panel
  41. How to hook CSS file according to theme selection in the customizer section
  42. CSS won’t style output of wp_nav_menu() correctly
  43. Is it necessary to prefix every css class in a theme framework?
  44. Custom CSS without css.php file
  45. Dequeue a style file which is making website load slow!
  46. Including Javascript options
  47. Do I need normalize.css when developing my own WordPress-theme?
  48. How to float an image in Gutenberg
  49. jQuery not available to other scripts
  50. How to make Isotope and WordPress work together?
  51. How to override checkbox styles if these inputs have a unique id [closed]
  52. Theme Javascript.php Overwritten Nightly [closed]
  53. How to disable wordpress from overload my stylesheet styles with customizer styles
  54. What is the meaning of WordPress’s recommended css classes and where are they applied?
  55. How to i style the elements from the TinyMCE
  56. Using page-id-{ID} from body_class() in local dev, versus live staging
  57. How do I remove inline style in featured image markup?
  58. different way to achive stylesheet_url
  59. Custom image size vs CSS sizing
  60. Why is my CSS not loading?
  61. theme style is applied on the dhasboard rather than the website
  62. SVG in list-style-image breaks when adding fill
  63. CSS added through customizer neglects the need of a child theme?
  64. How to override template files in parent theme?
  65. LESS not working in WordPress [closed]
  66. A post with a clear:both in its css destroy the theme design, and the sidebar is moved to the bottom
  67. multiple html/css files for wordpress theme?
  68. Why I obtain different visualization when I run the website on my local machine and on remote server?
  69. How to use the _S framework
  70. Tiny MCE custom styles, and preview in the backend
  71. How do you remove header sitewide from mobile only?
  72. WordPress Animation Adjustments
  73. getBoundingClientRect() showing different values on load vs scroll
  74. style variations hurt the editing performance
  75. wordpress script_loader_tag in function.php
  76. Why nav_menu_css_class doesn’t work with apply_filters?
  77. Default customizer colors aren’t displayed outside of the preview
  78. Find the source file causing a Mixed Content warning
  79. Ajax Comment Upvotes – Votes don’t always register
  80. Add my footer menu to the header
  81. Is there a way to add classes to a page when using a Gutenberg reusable block as page layout?
  82. How can I fix my theme header for my CSS stylesheet?
  83. remove_action(‘genesis_header’,’genesis_do_header’) hook not working
  84. WordPress doesn’t load css, image and js files after moving local installation folder
  85. How to generate a rtl.css file for themes?
  86. Load multiple css simultaneously using functions.php
  87. Customizer Image-Picker Preview Not Working
  88. Change header image on a particular page
  89. Mobile view logo background colour in wordpress
  90. Flexslider not working for my custom theme WordPress
  91. Can’t attach Javascript to theme
  92. adding navigation to genesis themes
  93. Alternating CSS classes for dynamic content [closed]
  94. wp_enqueue_script causes page to vanish
  95. How do I middle-align my header menu items in WordPress [closed]
  96. My CSS, footer and header don’t show up!
  97. Detect custom font size
  98. HTML to WORDPRESS [closed]
  99. WordPress search field won’t get wider
  100. When trying to run build script with gutenberg (with SVG import) – Error: Plugin name should be specified