Combine/merge orders from same user

Hi,
I need to merge/combine more orders in woocommerce from the same user. For my setup, I have users that imported, and they always login before buying. The offen created multiple orders, and then I ship it. But everytime I have to make several Packing slpps. Is there a plugin that combine orders, so I just have to make 1 packing slip for each custoomer instead?

As it is for now, I have to print out each packing slips for each roder, but to the same customer. That way I have to count the total ammount of skus, for each order. Not good. All orders from the same custemer is sent bulked.

Hope to har from you outthere!