Hello everyone!
I need to combine several records into one so that records with the same key accumulated all linked records in one field. That is, the table looking like this:
Create new empty table, link it to this table. Return here, and copy-paste primary field into new linked field here. Your empty table will be filled with the unique U1,U2… and links. Add “Elect…” field as lookup. Trasfer it to linked.
@Alexey_Gusev thanks for your suggestion, but I would like to avoid creating additional table. Actually, I already have a solution of my problem thanks to @JonathanBowen.