In order to create new image requests for one of your vendors, you will need to change the source of a particular product, or group of products. Because this step will replace the images you produce in house, you can only change the source when all the products have not started the Photography step.
There are two places you can access this feature, either at the Products tab or at the Production tab. Both place will require the same steps below:
Select the product(s) -> Click Actions -> Change Source -> Save.
Once you have selected Change Source you will then be able to change the source to Product Vendor, and define which Vendor should be able to upload images for this product.
If you have selected multiple products from different jobs or different clients, Creative Force will then separate the products into segments. You can then define the source for each segment.