Merging Sites in OneALL UI

Historically the business that I'm working with has had 2 ecommerce sites for separate concerns. We are now merging them into one for many reasons. How can we get the contacts from the 2 legacy sites migrated into the new site.

the legacy sites are both subdomains to the domain that we're moving the whole solution to.
locationa.main.domain
locationb.main.domain

Moving to main.domain

I have sent 2 messages to support, but still no reply after a week.

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