Starting with v4.4 of Sage 100 ERP you can create user defined fields (aka UDFs) without needing third party enhancements. What you cannot do is edit those fields from your Sage 100 ERP main panel. If you need to edit the Lot/Serial user defined fields you’ll need to use Business Objects Interface (BOI) scripting or purchase IM Lot/Serial UDF Edit from DSD Business Systems.
This enhancement also has a great manual which will walk you through the UDF setup process step by step – including screen shots of each custom office screen you’ll need to edit.
Download Manual or Visit Main Enhancement Page