How do I update a single document using powershell?

I am currently using import-pwdocuments to replace an existing document in projectwise with an updated document from a local disk. When the command executes, it displays some disturbing messages about deleting other files and subfolders from Projectwise because they are not found on disk.  The files are not really deleted.  I am not using the -MakeProjectwiseMatchDisk switch.  I do not see a way to block recursive action thru subfolders.

Is there another cmdlet that is more appropriate for bringing in a single file? (I'm new to the ProjectWise extensions. maybe I missed something?)

Is there a way to suppress the totally inaccurate message?  (I will be turning this script over to an end-user.)