Hi, welcome to the Spine forum!
You can uncheck Export
to exclude skeletons from export.
Skeletons - Spine User Guide: Export
Unfortunately, you can not set this option for multiple skeletons at one time, so select a skeleton and uncheck Export
one by one.
Also, is there a way to color code the skeletons, like give specific color to all props, enemy and players. I have to search the skeleton name and then need to do edits. by coloring i can organize all the skeletons.
I'm not sure whether you want to color the appearance of the skeleton or color its name on the tree, but if you want to color the appearance, you can edit the slot color, and if you want to color the name on the Tree view, you can do so by including a color tag in the name, e.g. [RED]. The latter is also showed in Spine Tips:
Spine Tips: tree bones colors
However, color tags are also reflected in the exported skeleton data. This means that when the skeleton is handled at runtime, it will appear like "[RED]bone" in the bone and slot names. If this is undesirable, it should not be used.
I hope these will help you.