Thank you for your post.
Yes, you can make a layout selection tool, and with FileMaker Pro 10, you can create a script trigger that automatically takes you to the layout. In FileMaker Pro 9, since script triggers are not available, you will need to create a button that switches you to the layout.
First, you need to create a value list with your Layout names and/or numbers. This can be accomplished by either entering the names of the layouts into a value list, or putting the names of the layouts into a separate table and then using the value list to reference the values in that table.
If you have a lot of layouts, you may want to consider writing a script that copies the name of each layout and puts it into the table. For example:
Set Error Capture [ On ]
Set Variable [ $counter ; Value: 1 ]
Go to Layout [ <Layout Number by calculation> $counter ]
If [ Get ( LastError ) > 0 ]
Set Variable [ $layout ; Get ( LayoutName ) ]
Go to Layout [ <layout with value list table information> ]
Set Field [ Layout ; $layout ]
Set Variable [ $counter ; $counter + 1 ]
Set Error Capture [ Off ]
Now that all of your layout names are in this new table, create a value list that uses values from these fields. You can then specify a global field on a layout as a pop-up list, and place a button next to the field that executes a Go to Layout Name by Calculation and reference the global field.
If you need clarification for any of the above steps, please let me know.