join floor and wall in structural elements

[mir]

Hi.
as you see from the annex I have a structural wall and a structural floor ... I would like them to join in the structural parts ... I don't remember how it is done but I remember that you could do... but I can't find anything online....

Thank you.
♪

 

[Tristan]

change > join. .

 

[mir]

thank you ... I had tried but I had not played with layers in materials

perfect