Shipping Methods

I sell product online. The product I ship from my location ships (USPS) United States Postal Service. However, the bulk of my product is "drop-shipped" because I carry a small inventory. The company that drop ships uses (UPS) United Parcel Service.

My question is this...is there a way to differentiate between the two shipping methods? Meaning if a customer orders product I do not ship can it default to UPS and vice-a-verse if I am shipping USPS from my location. If I allow my customers to be able to select the shipping method (option), I might have issues as a result.

Thanks,
Paul

No you can't differentiate between the shipping methods.
Both would calculate the shipping fees for all the products in the cart and the user would be able to select between one or the other.