How to use multiple pasteboards in OS X?
PTHPasteboard and OS X 10.10+

The PTH web site suggests PTHPasteboard Pro does not work on OS X 10.10 or later:


  PTHPasteboard is not currently available for sale, due to incompatibility with Mac OS X 10.10.


Thus it is probable there is no way to copy into additional pasteboards PTHPasteboard creates on OS X 10.11.

Alternatives

Alternatives listed on PTHPasteboard Pro's MacUpdate page include:


ClipMenu
Clipboard Evolved


Regrettably, the alternatives above do not mention OS X 10.11 support. Comments on MacUpdate suggest they may still work on the latest OS X.