Adding GROUPS to your hair mesh

By far the easiest way to work with a hair or body mesh is to choose a base hair/body that has the _number of groups_ you need.

You can regroup parts of your hair mesh to become one piece, although you will do well to construct your hair in ways similar to how Maxis hairs are created.

There is the hair repository which has info about some of the Maxis mesh hairstyles and how many groups they have which can help you pick a good base mesh to work with here: http://www.modthesims2.com/showthread.php?t=149677

Melodie9 has created some meshes for other ages, including toddler and child meshes - that have the same number of groups as their adult counterparts. She graciously allows people to clone her meshes as a base for your new meshes.

Here is an article about how to add groups to a hair mesh (or body mesh). Complicated, but certainly possible to do.

http://www.modthesims2.com/article.php?t=213184