Dxf import and cap holes

Hello.
Some questions
If I have 2 dxf splines ....import them in Nvil can I use these as Nvil splines to create an accurate object?
if yes how? attached pic

I made an object in drawmesh, the pushpull...what is the proper way to cap the opening?
attached file.

In drawmesh if I draw a line and at the 2 ends it has the green dots...I cannot duplicate it...
what is happening? because I can duplicate other items...

Tnx!

attached file for the 2nd question

If I have 2 dxf splines ....import them in Nvil can I use these as Nvil splines to create an accurate object?

Yes you can. Select the two closed splines you imported > go to vertex mode > Go to Visual Tools and choose loft > set divisions how you like.

I made an object in drawmesh, the pushpull...what is the proper way to cap the opening?

Select the edges or the opening > Go to Visual Tools & use cap hole + > then set divisions as you prefer

In drawmesh if I draw a line and at the 2 ends it has the green dots...I cannot duplicate it...
what is happening? because I can duplicate other items...

Select your line > Go to Tranform Option of DrawMesh > Duplicate Line is available there. Alt+Space is the key to duplicate. On my windows system co-pilot fires up instead but you can turn it off in Copilot > Account > Settings. Account is hidden behind the sidebar of copilot.