If your User Defined Function is in a currently open workbook OR in your
'Personal.xls' workbook OR in an add-in you've created, you will be able to
use it by selecting...
Insert / Function
Highlight either 'ALL' or 'User Defined' in the "Function Category" window
Scroll down until you see your UDF in the "Function Name" window.
Highlight the UDF and select 'OK'
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