Modify lookup default but still show lookup name, or, if so, another solution

[aitorm]

I am creating a lookup because I want two drop-downs menus in one block. In this case, it is a sink that can be simple or double and then circular or squared:

When I change the lookup, the first sink must move to create room for the second one and the countertop becomes bigger. The problem is that if I want to move the position of the sink or the size of the countertop, it tells me "personalizado" because it doesn't match the lookup default.

Of course that is like that because I named it so:

Do you find a way to show countertop size and sink position and at the same time than number of sinks and shape?

Thank you so much

[KirkWM]

Sounds a lot like this situation here, with custom double look up action, except it looks like you want more fine tuning but perhaps this is a start.

https://youtu.be/cYZGh70ttF8