two menus show different menu based on what menuitem is selected on menu1

You could create just one menu in wordpress backoffice, and menu 2 would be a submenu of each item, like this:

  • menu 1
    • Home
    • Tax
    • Company
    • About us
  • menu 2
    • Home
    • Posts
    • News
  • menu 3
    • Home
    • Test 1
    • Test 2

Then you could use some jquery and css to show each submenu according to what you choose.

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