You can refer the document C:\MentorGraphics\9.3.1PADS\docs\pdfdocs\padslayout_tut.pdf
It will help you with the layout commands as well
first open the pads logic and the select file-->library-->Library-->parts-->new
new window open then select edit graphics-->then selectdecal editing tool draw your symbol
after complete File-->reture to part
save your library in your library path..
Untitled.png 23.8 KB