If you want to bring over the entire table as a separate table, you can use Import Records and Import to a new table.
If you want to add field definitions from one table to an existing table:
Open Manage | Database | Fields
Select the field or fields you want (You can use the shift and control keys to select multiple field definitions.)
Click the Copy button in the lower right corner
Switch to the file/table want and, using Manage | Database | Fields, click Paste.
THANK YOU! THANK YOU! THANK YOU!
This has saved me several days of very boring work!