David,
One more way to do this -
1. In the PDM you have an option under the "New" toolbar button called "Add New Product".
Add new product.JPG
2. Here you can add a product not in your Master database and check the "Owner Furnished Equipment" checkbox. For OFE products you are never prompted to save to master. Also OFE products can have labor but no product price.
Also FYI if you never wanted to be prompted to save to master for anything there is a new checkbox in 5.5 SP1 in D-Tools | Options | General tab called "Prompt to update MasterTable after updating product/package".