This is how you process a "Soap Base" for "Rebatching." You can see how I made this base by watching my other tutorials: "Simple Shortening Soap." I use this process to make my other two soaps "Sexy Cinnamon Soap" and "Orange Zest Soap." You can find both tutorials in my Channel.
Essentially... all you need to do is grate the soap, then grind it down into particles with a blender. If you prefer not to hand grate it, feel free to use a food processor or a hand grinder. You want to get the soap as small as you can, particles of soap dissolve far easier than grated, or chunks of soap.
This is a time consuming process but there are many benefits to rebatching your soap.
A: Any scent you add will last longer, and have greater strength.
B: Rebatched soap has a silkier texture (though... sometimes less suds) on the skin. Many customers prefer rebatched soap but can't tell you why... it's cause you were sneaky, and rebatched it.
C: If you have a batch of soap that "Seized" shortly after "Trace" you can easily fix it with a rebatch. 99% of the time if you think your soap is a bad batch... it is NOT. You can almost always rebatch it.
D: Not only scents, but colours last longer and are more vibrant in a rebatched bar.
If you opt for using a grater, try very hard not to grate your fingertips, as this gets blood in the soap; and that's not so hip.