Forum user @Z-Key Aerospace turned this mod over to me, original thread is here: https://forum.kerbalspaceprogram.com/index.php?/topic/139223-ksp-v145-tac-fuel-balancer-v220/
TAC Fuel Balancer
Easily refuel from space stations.
Keep your spaceplane or VTOL balanced.
Dump spare fuel before re-entry.
Lock and unlock tanks
This mod can transfer fuel, or other resources, between parts on the same vessel (including docked vehicles) from a simple GUI.