If you go into the hypergraph, find where your Geo A feeds into the deformer. Manually create a PolyUnite and connect GeoA and Geo B to it, then replace the original input to the deformer with the ouput of the PolyUnite.
If it was just deformers you can use the History Window to change the order. But that doesn’t work for non-deformers, AFAICT:
@Theodox
I can’t use PolyUnite since although Geo A and Geo B has to go more or less the same direction they have different controls.
Use case would be adding a squash and stretch to a head group. The head group can consist of separate geos such as the main head, the brows and the props.
The relationship editor should do it but in Maya 2020+ if you don’t turn off the component tags creation in preferences under settings-animation, it won’t allow you to use the relationship editor since it doesn’t create sets for deformers and you would have to use the component tag system…important to know if you are working in newer Maya and have to save it back to an older version, since it will break the deformers if you do need to give a file to someone on an older version.
Had the same task earlier and went back to this thread for referenced.
Realized that I didn’t respond at all lol.
Anyhow, the solution work as expected.
Also +1 on the “turn off the component tags creation in preferences under settings-animation”.
I wouldn’t be able to figure it out myself.