1. Navigate to Customization > Lists, Records, & Fields > Record Types > New > Create a Custom Record.
2. Use Name=Test and hit Save.
3. Create a custom record field with the settings below:
• Type = List/ Record
• List/ Record = Field
• Store Value = T
• Under Sourcing & Filtering subtab > Filter Using = Script ID / Compare Type = contains / Compare Value = custcol%
4. Click Save.
Note: This works provided that there is an existing custom Transaction Line Field and the custom field ID starts with custcol.