You can save a single UDF in an .Ima file.

You can configure a UDF library structure that represents either a single UDF or a folder of multiple UDFs. See Tools -> Options:UDF for UDF library path configuration.

Version control in the edit mode

You can revise a UDF as needed to add new functions or to resolve logic problems. LOGO!Soft Comfort uses "Version" to identify different evolving snapshots; the valid version range is 0.0.1 to 255.255.255. Any change to a UDF generates the version prompt:

The new version must be an increment from the previous value. For example, in the example shown above, version 1.0.3 or 0.254.3 would be invalid.