My apologies for the late reply to this - I thought I had already responded.
Edited: But, yes, it´s true, I could copy the file on the location, and I have to change the proxy to the new element.
However, saving with different name in the Plugin results less clicks.
I had a look at adding a Save As button for ORB proxies. However I wonder if it is actually easier to simply copy the file in Windows Explorer. If you have the Explorer window open with the folder containing your proxy ORBX files, it is a single click to copy. Whereas it is multiple clicks in AC, and there are some complexities with AC regarding special characters in filenames, and the way it "remembers" the previous folder open which the Windows Explorer handles better.
1. Importing OCS as a material. The OCS should have a Material-out Node, the same as a Proxy should have.
If you import from OCS, the texturemap paths are absolute, so if you copy the pln file to another PC you have to copy all the teturemaps across. Whereas if you import from ORBX, the texturemaps are contained in the ORBX, so you need to copy the source ORB file with the pln. Either way I guess you need to copy the assets - however it's neater with ORBX. You can also "Import Material from the Local DB" and select an OCS from another folder and it should import OK (I didn't try it, but it will probably work).
2. Copy with clipboard. Unfortunately there is no chance to copy an existing Material-Setting in AC-Plugin to the Editor. It would be nice to select a material or something in the material-node (for example a texture), copy it and insert it in the new Proxy-Editor.
I will add an option to copy/paste to/from the Windows clipboard.
I also also looking at offering an option to edit the material in the NodeGraph (as you do the proxy). Pls see
https://youtu.be/UwPthyrV6zw for how this would look. I need to wait until all the issues are found with this workflow in the Poser plugin before I migrate it to AC.
Paul