However, I can interpret your request as needing an covering the following likely topics:

Deep or wide cracks where you want a smooth, level surface.

Most users toggle Surface > Defects > Fill Cracks . That is . To "repack better," you need to move to Version 3.0 : Hybrid Meshing.

Plane thin curls of matching wood and moisten them so they can be flattened under weights. liquid hide glue or high-quality wood glue like Titebond III (waterproof and durable) to the shavings.

: For very deep cracks, drip thin Cyanoacrylate (CA/Super) glue or a slow-cure epoxy into the crack first [4, 5].