Align floor to the bottom

[DanielKP2Z9V]

Is there any way to make a floor aligned to the bottom of a level instead of the top? That is if its structure increases it would grow up instead of down? 

I have a floor element, which is expected to change, however it's nested inside groups, which if need to be adjusted one by one. It would be helpful if it could be aligned to its SSL instead of FFL and grow up if needed.

[Simon_Weel]

You could use a Roof instead of a Floor.

[ToanDN]

Roof and ceiling align the the bottom.

[DanielKP2Z9V]

thanks, @ToanDN @Simon_Weel , that makes sense, however ideally category would stay the same for the sake of scheduling.