Not sure if this is a common requirement, but here goes...
I have quite a few web sites I host for my clients & a lot of them are switching over to a WP driven site - under my recommendation!
But to set them up while the old site is running seems to be tricky under Pleask.
( currently on 8.6 ).
So I can access the site once the domain is setup via the IP address, but after I install WordPress, it get's tricky! It does not seem to like it and keeps removing the IP address and changing the URL to be the real URL.
I'd be interested if anyone else has this scenario and has any tips on how to get around it....
I guess one way is to set it up locally ( I use XAMPP ), and then upload everything and export/import database - But this is more time consuming.