Moving .cwp files with audio (cakewalk projects ) to another drive

As long as your samples remain in their original locations, most cwp files will be OK on another drive, because most internal references are either to the system registry or they are relative to the folder the cwp resides in.
 
The biggest headache you'll encounter is the Recent Projects list, which is stored in the registry and will still contain the original pathnames. Here's the easy way to avoid that: load each of your last 12 projects and use File->Save As to copy them into the new location.
 
Alternatively, you can edit the registry and change the pathnames there. It's quicker if you're not intimidated by editing the registry. Look under HKEY_CURRENT_USER\Software\Cakewalk\{Edition}\Recent File List. {Edition} depends on the SONAR edition, e.g. if you're running Platinum it'll be "Platinum".