Hi Cathy,
First of all, you can not avoid processing PCN in SAP WM, you have to process it then only material stock will be moved from one stock type (unrestricted, Q,S) to another type in warehouse and for that you have to create TO in WM and confirm it.
Now question comes, if you do not want to move stock and want to keep stock in same bin after posting change, make setting at storage type level there is one check box 'Post to same bin' check that box for all storage types where you want to put stock in same bin even after posting change.
Now if you do not want to create transfer order manually, you can specify immediate transfer order creation for movement type in IM-WM interface for specific movement types, so once you do posting change system will automatically create TO.
Next is confirmation of transfer order, if you do not want to confirm transfer order then again you can avoid this by removing putaway/removal confirmation boxes at storage type levels. But this will be for all kind of movement types, system will be confirm transfer order automatically.
BR
Kamlakar