adding to list

[kingsgambit]

I am trying to build a quote database.
On the main form I have a combo box, the user can pick the catergory, the list box below shows via a query want is avaiable in that catergory.

I want to be able to select an item from the list box and click add , then another list box would show what I added then to be able to repeat the excerise until I have selected all the items I want.

From this I could produce a report.

Any ideas how I would do this

 

[kingsgambit]

How would I be able able to add items to the subform