Merge ends of two Curve paths to form one path.

I’m making a knot with several twists.

I used curve paths.
I made the top twist with two strands.
I made the bottom twist with two strands.
Now I need to join the paths where the lower transitions to the upper.
I imagined setting the directions of the paths to flow correctly and then using a
“merge” type command to join the end points.
Problem is, I don’t find a merge for paths.
You can see the two places the ends need merged below.
Any ideas would be appreciated.

Select the two ends and press F to fill between them.
Alt+C closes a curve

That was simple.