You can define the assignment of Festo part properties to EPLAN part properties in the festo.cfg configuration file. These properties can be entered in the tabs of the EPLAN parts management.
The Help text Parts Management: CSV Import and Export for Parts contains the part properties sorted by the tab designations. And in the Help text "EPLAN Properties" (under the overviews) you can have the EPLAN-internal properties for the "Part (stored)" object class sorted alphabetically.
See also