Feed Question

1. Is it possible to have more than one feed for the same channel?  For example, is there any way we can manually push JUST new product images and no other information around the product from RO to our e-commerce channel, Shopify? Sometimes we redo the images, but we don't want it to completely override the product in Shopify...just the images. 

2. Is it possible to have a field for this feed contain an "If, then Statement" that leaves something blank or do all fields need to be populated to push? It keeps giving me an error with the blank field.  We are trying to figure out how to leave the Compare At Price blank in Shopify if our MSRP price = Offer Price in RO. 

Thanks in advance for your help

September