Sage 100 – How to add a User Defined Field (UDF) to Customer Maintenance. Gallery Sage 100 – How to add a User Defined Field (UDF) to Customer Maintenance. Sage 100 tips and tricks Sage 100 – How to add a User Defined Field (UDF) to Customer Maintenance. Mike, We currently own Sage 100 and would like to [...] By | 2019-06-27T21:42:11+00:00 June 27th, 2019|Sage 100 tips and tricks|Comments Off on Sage 100 – How to add a User Defined Field (UDF) to Customer Maintenance. Read More