How can I charge one shipping fee for items from multiple locations?

[GInThePark]

I have a Shopify store where I have items from multiple locations, for example, some I sell myself, some are shipped by someone else (drop shipped).... etc. Sometimes, customers buy more than 1 item and one of the items will be from another shipping location while the other will be coming from me. Because of this, the customer, in the beginning, was getting charged shipping twice. I had to resort to "limited time free shipping" until I figure out a solution. Is there any way to just charge 1 shipping fee no matter where multiple items are coming from? Seems it's a major Shopify issue that has yet to be resolved.

Thanks in advance for the help.

[Ketiabell]

Following

[DonnaS]

If you're open to looking at Order Management systems, Orderbot software solves this issue with shipping