Importing custom functions (FileMaker Pro Advanced)
You can import custom functions from other FileMaker files. You can also copy and paste custom functions within a file or between files. See Using custom functions (FileMaker Pro Advanced).
When you import a custom function, FileMaker Pro automatically resolves dependencies when custom functions call other custom functions.
To import custom functions:
Choose File menu > Manage > Custom Functions.
For more information, see Opening files protected with passwords.
Tip  You can press Ctrl-click (Windows) or Command-click (OS X) to select non-contiguous functions, or press Shift-click to select contiguous functions.
The Import Summary dialog box appears.
Click Open Log File to view the import log file, or click OK to close the Import Summary dialog box.
Note  The custom function you imported appears at the bottom of the list. If FileMaker Pro determines this function is invalid in the context of the target file (for example, a dependent function, field, or calculation is missing from the target file or the function contains an invalid field type reference), the imported function is enclosed in comment characters (/*<function_definition>*/). For more information, see Custom Function dependency rules (FileMaker Pro Advanced).
If you import custom functions from another file, then click Cancel to close the Manage Custom Menus dialog box, all changes you made while the dialog box was open are discarded and the imported functions are removed from the file.
Related topics 
About custom functions (FileMaker Pro Advanced)
Using custom functions (FileMaker Pro Advanced)
Functions reference (category list)
Functions reference (alphabetical list)