Here is a sample file https://www.sugarsync.com/pf/D9559058_790_999508414
You don't need a calculation. A portal is based on a relationship which should be Customers::Customer Id=Orders::CustomerId then you would have a filter on your portal for the status you want to view.
One more question, is it possible to use two criteria in the filter? Would I just use the "AND" function?
It looks like your original filter expression would have worked if you had switched the 0 for the 1 in the If function. The expression could also be simplified to:
Customers::Customer ID=Orders::_CustomerID and Orders::Status="Quote"
I am assuming that you want the records to be visible if the above expression is true.