Copying and pasting field schemas (FileMaker Pro Advanced)
You can copy fields from one file and paste them into the same file or some other file. Field data is not copied.
1.
Select File menu > Manage > Database > Fields tab.
2.
3.
Click Copy, then click OK.
4.
5.
In the Fields tab, choose the table where you want to paste the field.
6.
Click Paste, then click OK.
Notes
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FileMaker Pro Advanced retains data source references to fields if they are valid when you paste. If you copy multiple fields that reference each other, copy them in one step to retain the references. If you copy them one at a time, the references may be lost. Check all data source references after pasting to ensure they are valid.
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There is a difference between duplicating and copying a field: Duplicate duplicates a field within the current table. Copy makes the field available for pasting to another file. See Duplicating field definitions
Related topics 
Copying or importing table schemas (FileMaker Pro Advanced)