RESERVED SKEY

Hi

for creating User-defined SKEYs, I always going through the creating my sketch and then importing to draft and creating "symbol file". tills today my colleague said to me that there is some thing like Reserved skeys, that we could put our sketch there and select from catalog, detail text dialog box. Is there such thing? How the original skeys of PDMS could be found?

I hope that ask the question right. Thanks for helping me.