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Take a look at the import export tool: https://webhelp.optimizely.com/16-9/cms-admin/exporting-importing-data.htm
There isn't a best practice as far as I know but before you can move content from your single site to your multi site then as you implied you'll need to sort the code out first.
Which basically means bringing both code bases into alignment. Here's some in no particular order I can rattle off when I've done previous migrations:
Background:
There is a multisite environment with a shared database. The codebase is also shared.
We have another single site which we would like to integrate into the multisite environment.
So essentially we need to merge the code and migrate the content from the single site into the multisite environment.
Are there any best practices to follow to achieve this? How do we achieve this with minimum time and impact?
I am posting here to see if anyone has done this before and what they followed. I am hoping this is too difficult and can be achieved with couple of days work.
Any help or direction is appreciated!
Thanks.