Setting up Sage accounts 2007. How far do I need to break things down?

I’m moving from Excel to Sage accounts 2007 v 2.
I’ve taken classes, but now they’re over and I’m actually starting use Sage I am questioning how far I should be breaking things down.
I administer an event at which people buy tradespace. They fill in an application form, tick the box which says how much space they want, and put that in a totals column.
Then they add electricity should they want any, and add that amount to the totals column.
Then they add tickets if they want to buy those, and add that to the totals column.
They then add the totals up, work out the vat, and send me a cheque for the total. (I don’t generally have to invoice them)

My question is, in Sage, when I am setting up balances for these customers, should I be separating out electricity and invoicing this seperately from tradespace, and tickets, or should it all go in as one transaction. I am in the UK.

I would never recommend sage, as it is dogmatic, I use quickbooks far less complex

Good luck