I’ve found a piece of CC online which is a game cover case and there’s around 10 swatches all featuring different games. I would like to create more swatches or preferably a new item of this with ...
Yeah that's basically it. All you need to do is get one of the textures of one swatch and edit it in a program like photoshop or gimp, then replace the diffuse map. Since you're not manipulating the mesh at all and just adding swatches, you can hit the new swatch button under the object category
Or if it's a CC item you're recoloring, just adding a new swatch from opening the .package file in S4S.