Business-feature questions

[Gareth Edwards]

I'm trying to use GnuCash to run the finances of a social club and I
have a couple of questions about the use of the invoicing and A/R in
GnuCash. Each member is a Customer, and subscriptions are invoiced

1) Quite a few members pay in advance, which GC is showing as
pre-payment in A/R, which is fine. However, I can't figure out how to
show the current balance for any given member. How do I do this?

2) One of our members has a positive balance and has decided to pay
the subscriptions for this month on behalf of another member out of
this balance. How do I transfer a payment from one Customer into the
account of another Customer?

Cheers
Gareth