Sum values in form

[The Bey]

I've made a form which is based upon multiple queries. Each query is linked to the form using combo boxes, and essentially what happens is I can select an option and a number is output.

I've done this using the AfterUpdate event and it all runs nicely but what I would like to do now is take these values and put them into a sum/multiplying formula on the same form.

I tried doing it through a query but can't get my head around the idea so I'm lookin for some quick help with this; any will be appreciated

 

[jdraw]

You're going to have to show us some code and more description, if we are to help.
Without that all we can do is guess.

 

[The Bey]

I've not written the code so I don't even know how to respond. I could attach the database and you could have a look yourself if that'd help?!