woocommerce manual database imput

Hi there,
I have a question about manually inputting information in a MySQL databases (specifically in meaning Woocommerce order databases). I have some orders, that I get from another database and have to input them in in a Woocommerce database, which by now I found out that it consists out of several different ones, and not from just one. The Woocommerce is a plugin in WordPress. Does anybody have any idea on how that could be done?
Some additional information: I am working with WordPress 4.4.2 and Woocommmerce 2.5.5..

Any ideas are greatly appreciated! 🙂