Hello!

I have a few questions on a form I am trying to build.

I am trying to set up a service request form, with drop downs for various services; one such might be (options separated by '/');
"Room 1, 30 Minutes"/"Room 1, 60 Minutes"/"Room 1, 90 Minutes"
And another is,
"Room 2, 30 Minutes"/"Room 2, 60 Minutes"/"Room 2, 90 Minutes"
And yet another would be,
"Projector, 30 Minutes"/"Projector, 60 Minutes"/"Projector, 90 Minutes"

And so on.

The two things I would like to accomplish are; first, and probably simplest, have a value attached to each selection (so room 1 30 minutes is $100, while room 1, 60 minutes is $150, and Room 1, 90 minutes is $200 - and Room 2 would have different prices altogether); then as each drop down is changed, have a 'total' field calculated. So if Room 1 is requested for 30 minutes ($100) and Room 2 is requested for 90 minutes ($180.00), the total would update to $280.

Second, and something I am not sure if it is possible, I would like a second hidden value attached to each drop-down, the 'time' - and require a minimum total time among all rooms/services/etc. So that if the minimum time is 90 minutes, any one room/service for 90 minutes would qualify, as would any 3 rooms/services for 30 minutes each, but if only one room or service is selected for 30 or 60 minutes, the form generates an error "90 minutes minimum"...