Best way to convert two single WordPress sites into Multisite network with shared user base

Question

I have two WordPress sites, One is ecommerce site with WooCommerce and other is private login only site for customers of the ecommerce site.

Now I am looking for a way to convert them into a multisite installation with same user base across both sites.

It will great if someone show me a way to achieve that without losing any data from the both sites.

Answer 1

To me the best way would be to:

1. Leave the ecommerce site intact since it's where all the important content exist.
2. Enable multisite on ecommerce site. See official documentation: https://codex.wordpress.org/Create_A_Network
3. Export everything on the private site (Tools - Export - All content)
4. Import it on a new site created on the new network.