Can I get a little bit of help trying to construct a fitting family?

[ReachAndre]

I have seen similar questions around without answers that fit what I am looking for.
I am trying to make a split fitting that I seem to be unable to find.
I have attached a Jpeg Showing both sides of the fitting.
I have also Attached my Union Modification.

The closest I've got was to modify a union.
(Problems include no flow through CFMs and non adjustable once connected to.)


I am trying to split the duct, and have two connections. With the following parameters

- Same height for all ducts.
- DUCT-B width + DUCT-C width = DUCT-OVERALL.
- DUCT-B and DUCT-C not necessarily the same widths.

Thanks all,
Andre
89227

[drewj]

I made some modifications, set it as a Wye, linked the flow values to parameters.

It now splits the flow coming in to the 2 going out at the ratio of the widths...

File is attached with example.