Lusiver a écriti've created animations with spine but didn't make skin holder, i have created more than 30 animation can i make skins that can do this animation ?
In the tree, click Skins then New Skin. Also in the tree, unselect the Bone and Slot buttons:
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Now your skeleton only shows attachments in the tree. Click the first one, then shift click the last one to select them all. Now at the bottom of the tree, click New... then Skin Placeholder. This will move all the attachments to skin placeholders, without messing up your animations.
I have trouble understanding your other questions. Try simplifying your question and just ask once.
You can duplicate a skin in the tree, then change the attachments. If you drop an image or attachment on an existing attachment, it will be get the same SRT. You can also copy/paste attachments to set the same SRT.