how to only have one custom post type post?

I would suggest creating a Theme Options page for this purpose.

https://wordpress.stackexchange.com/questions/tagged/theme-options

add_options_page() in Codex.

Or is there anything special in the post edit screen that you want to use that would be hard to get into the Theme Options page?

Related Posts:

  1. Is It Possible To Add Custom Post Type Menu As Another Custom Post Type Sub Menu
  2. Placing a Custom Post Type Menu Above the Posts Menu Using menu_position?
  3. Custom Post Type Settings page, choose page to display archive
  4. Put update-like notification bubble on multiple CPTs menus for pending items
  5. Meta Boxes: ‘admin_init’ or ‘add_meta_boxes’ hook?
  6. Show Custom Taxonomy Inside Custom Menu
  7. Remove “posts” from admin but show a custom post
  8. Can I have Post Types under other Post Types in Admin menu?
  9. Is it OK to move admin menu items?
  10. How Do I Programmatically Better Organize Custom Post Type Menus?
  11. Add Post type menu to another menu
  12. How do I create multiple post types in same menu section in WP-admin?
  13. Is there a way to keep a custom menu expanded when editing a custom post type?
  14. Menu position (admin menu) of pages
  15. How to remove/hide elements from the admin menu?
  16. Remove Custom Post Type menu for non-administrator users.
  17. How do I code access to the built-in UI of a CPT when it’s placed as submenu of another CPT that is protected by role?
  18. Custom Post Type and taxonomies’s labels localization not working
  19. How can I use a different default admin menu icon for custom post type?
  20. How to allow “Add New” capability of CPT when links to its UI are placed as a submenu?
  21. How to add new tab to admin list of posts and handle result list
  22. Displaying different custom post types under one admin menu
  23. Add management screens to post type
  24. How do I alter the position of a Custom Post Type menu item within my plugin admin menu?
  25. How to add custom post type under option page
  26. How to remove default tag and category options form a custom post type admin menu
  27. Prevent custom taxonomy from being added to admin menu?
  28. Trying to add script to specific admin page is not working
  29. Custom Post Type / Tab Limit
  30. rewrite custom post type slug in wp admin
  31. How do increase the amount of links shown down the left in the admin menu?
  32. Move custom post menu to under plugin admin menu
  33. Insert & order custom post types in/as submenu
  34. With two custom post types, how to make one a child of the other in the admin menu?
  35. Custom post types as sub menu pages and role capabilities issue
  36. How to display Custom Taxonomy under Custom Admin Menu?
  37. Able to edit custom post, but unable to create new custom post when within submenu. What capability is missing?
  38. Add Custom Post Type as top level menu item for a custom page
  39. Possibilities for the edit.php admin panel? [closed]
  40. Add Custom Post type menu to another menu in specific location
  41. How to remove post listing page for a custom post type
  42. 2 Different Custom Post Types in Submenu
  43. Ordering Submenu Pages in WP 3.1
  44. How to group navigation items in the admin panel
  45. Conflict between Capabilities and Menu Visibility with Custom Post Types
  46. Getting post attchment URL to populate a CPT Admin Page Column
  47. Using menu_position to add two entries between Dashboard and Posts
  48. How to add query args to links to CPT admin submenu
  49. Reusable metabox backend and frontend
  50. Multiple custom post types showing up in edit.php
  51. Top level menu position overwrites another entry
  52. admin_head-post.php only works after publish / update
  53. adding page types in menu
  54. Metaboxes inside Tab
  55. Restrict admin pages for specific user role
  56. Cannot include custom post item within a menu
  57. How can i redirect click to new admin page not to edit screen in post table
  58. Is there a way to display a custom post type menu item as “users” submenu?
  59. remove duplicate name submenu link from the custom post type
  60. Subset of Custom Post Type From Admin Menu Based on Meta Data
  61. How to override post-new.php with custom template
  62. Setting up a page to house certain types of posts
  63. Changing menu label to post name for custom post type
  64. Show custom taxonomy not in submenu
  65. Duplicate “Pages” Item in Admin Menu
  66. How to add elements to WordPress appearance->menu admin?
  67. How to avoid hardcoded text in a custom page template?
  68. Limit number of posts under a post type?
  69. Custom Post Type Causing Admin Sidebar UI Issue
  70. Issue on CPT Custom Menu Position in WP
  71. Custom Taxonomy Showing in WP Menu
  72. Show custom taxonomies in admin panel under custom post type
  73. Add top-level menu pointing to a different custom post type?
  74. Separating a custom taxonomy from blog post-type
  75. wordpress custom post type shows other cpt posts in admin menu
  76. Custom post types not showing in the admin menu on production, but shows locally
  77. Admin menu link with variable
  78. Can’t add custom post type archive page to menu
  79. One custom taxonomy with unique sets of labels for two post types?
  80. Redirect to first child on Custom Post Type (without template)
  81. Assign CPT archive page attributes
  82. Move content between custom post types
  83. Custom post types problem
  84. How to get postname in custom page?
  85. Query custom post type based on post id and custom field value
  86. Pods CMS: How to add custom column to Adnvanced Content Type
  87. Custom post type, custom taxonomy, query posts only from taxonomy (children of)
  88. Creating Sections for Post Types
  89. Give each post type label a different color?
  90. page not found for single-type.php file
  91. Show list of custom posts with respective attachments?
  92. How to output an image or icon for selected check box in a custom post
  93. Check IF single OR multiple custom data has been entered
  94. Set a hard-coded page-template (post-type-archive) as home/front-page of my wordpress blog?
  95. How To Get Custom Post Type Category Title
  96. populate array with posts
  97. Displaying tags associated with posts in Custom Post Type
  98. Display custom posts randomly in custom taxonomy archive
  99. Using custom post type as taxonomy
  100. Transferring data to the end of a transaction with the Shopp Plugin
Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)