Adding exclusions when creating a new partner feed

You can use step 6 of the Partner Feed wizard to add product exclusions for your partner

If you want to exclude any specific products or groups of products from this partner then you can do this easily on this step. It uses the exact same exclusion tool as you will find on the product viewer. If you want you can easily add these later as well on the Product viewer.
If you do not need to exclude any products then just skip this step.
Then just review the feed and decide if you want to built it now to work on it in the product viewer, which would be our recommendation or let it build on the next scheduled update along with the rest of your data.