Draw Bezier Curve on other Curve

Hi,
I try draw branch using Bezier edit mode + geonodes, and try draw second curve “grow” from first curve, its easy way snap automtic pencil to curve?

I dont see an easy way to match a manual made segment to one from geonode.
Why mix and not make it complete in geonodes?

Becouse hand draw give me more control shape, I also made branch using only geonodes but this way should look more realistic