Returning Charges

Hi, I’ve added the sendle plugin to my woo commerce shop, and i will be offering shipping and return to my customers, at checkout it shows the charge sendle charge for one way delivery. Ive tried to add a value in the extra cost part but i can’t have one extra charge as delivery prices change from metro to rural, is there a way at checkout that the price for the return postage can be added in automatically when the person checks out in their cart? Can I add the return fee as well to checkout, so the customer pays for delivery and return all at once?

Cheers Jason