Let me start by saying that I have been trying to do this in Interfaces but I've also had a look at the new Forms feature.
What I would really like to do is present the user with a grid with 4 columns:
Make | Line | Model | Qty |
When the user clicks in the blank line under Make, they get a drop-down that lists all the current values in the Make field (unique values). Then they do the same for Line and Model, based on the selection under Make - i.e. a decreasing filtered list. They then manually enter a qty. They can then add more rows as they complete the 'form'.
Ideally they would also be able to have the option to ignore the drop down selection and enter a value in any column that doesn't already exist in the data.
I can't work out how to do this and don't really know if it's a form view on the Data area, a Form in an Interface or if I would use the new Forms feature.
Any ideas ?