Vector layer

Shape → Bezier curve

 

When erasing the original line art when drawing a line

Layer-> Ruler Frame-> Vector to Ruler

Since it is a vector layer, you can erase all the connected lines by erasing a part with a vector eraser.

 

Only the Bezier curve ruler remains

If you do not select a ruler from the vector, everything will disappear

If you draw with in and out, it will trace as it is