Exporting drawing substitions to the Library

How can I store drawing substitions in the library? When I drag a layer with e.g. eyes, the whole layer is stored, with every single frame. How can I export only particular figures to use them later in another project? Thank you for your help!

once you create your template from your layer (using your example, an eye blink), you can edit the template, delete any unwanted drawings, and then save.