Hello Lamhuy, for the feet you can use the vertex groups Bone.037 for the right shoe and Bone.027 for the left shoe. Alternatively if the shoe isnt too big you can also use the lattice parenting method with the target being either Lattice_Leg.R or Lattice_Leg.L.
I hope this helps. Otherwise i recommend joining my discord server so that I can help your more easily.
Pardon, i really don't know how to parent object. For example, i have pair of shoes and i wanna attach it to character's feet. I don't see deform bones in the bone collection in order to deform with automatic weight. When i use thomas blue evil, it can be solved easily right in the add on ( the plus icon next to posing). But thomas legacy doesn't have that. Pls guide me how to do automatic weight with this rig