Child Mesh to make preteen Help

Hello, 

Okay, I figured out how to get the nude mesh for both top and bottom by downloading the full body nude mesh someone made on this site. Then I imported the mesh.png while in CAS standalone in S4S. Next I was able to export the child sim with the nude mesh from S4S into Blender. Now, my problem is trying to connect the top and bottom mesh into a single sim child. I think that means I need to append it, but I tried and don't know what I'm doing. I've looked everywhere for the right guidance, but I can't seem to find a solution. 

Update: I manage to combine the nude meshes together. Now, I need assistance with added the rig to the combine meshes. Also, after appending the meshes how do I export all of them into a new blender file and maintaining the textures? 

Update: How can I add the female child white tank top from S4S to my new mesh? Every time I get ready to export it into Blender, the original white t-shirt still shows under the tank top. Is there a way around this? 



My project: To adjust the height of child sims to make them look like preteens. Do I need to use animation or CAS for this? Your help is appreciated!

Thank you,
Joy