Polygons attaching

hello!
I wonder what s the tool that attaches two polygons together and result in one surface .. like in NURBS attaching and stiching ...is there a way also to adjust tangency between two polygones? I appreciate all quick help ..... thank u

I think your taking about 'Combine' under Modeling/polygons/combine, thats after u select 2 poly objects. It combines the shape & transform nodes but will leave things like shader nodes seperate.

later.

after combining, you might wanna go to Display Custom Polygon Display option and enable border edge
then select object that you combined and either use merge multiple edges or one by one merge verteces from eath surface, or merge edge tool.
If u get weired results that you didn't expect use Polygon->Clean Up check all options and select and clean up in drop down box don't check last two options in the buttom part