🚀 go-pugleaf

Imd like to number subsets of records in a reasonable way. To be
specific, I have a database of people with multiple records per person.
Imd like to create a sequence number for each record within the group,
starting with the number one. i.e. Imd like the record set to look like
this

Jones	1	.....
Jones	2
Jones	3
Adams	1
Adams	2
Smith	1
Smith	2
Smith	3
Smith	4

The numbers are to be in their own field and should be revisable as new
records are entered.

It seems as though I ought to be able to do this with 
same file, but Imve run into trouble because relooking-up always goes to
the first instance of the record. Any suggestions are welcome - even a
good reference on how to use relookups effectively. More specifically, is
there a way to copy the value of a field in the previous record to one in
the current record? I believe that would solve my problem.

BTW I saw an old Claris note suggesting the use of exporting to a clone
and then doing a fancy lookup. Thats too much for me.