possibility to replace the subject of merge inheritance feature

[lbono1]

when I use the "merge inherits"
is not longer possible to edit the linked object in the function except with his instance

in my opinion this capability is very useful

[StephenW]

This is a duplicate of this one

Make it easier to replace out imported merge/inheritance models

And similar to this one:

allow replace reference of an external inheritance by replacement assembly

[olivierlp]

Hello,

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