For S1, you need to apply orbit and TOPS split.
Then you can add all products to the backgeocoding.
Create a stack of interferograms on the resulting stack.
Deburst both the backgeocoded stack and the interferogram stack.
Add an elevation band to the interferogram stack.
Add debursted stack and debursted interferogram stack to the stamps export.
I could update the stamps export to allow multiple individual interferograms. This would allow you to choose slave-slave pairs.