Thank you so much for your reply! I really appreciate your time. A couple of what-if’s though…what if (a) I can’t update the current site’s WP because it is already known that an update would “break” stuff (a lot of customized code in there, and no child theme). This, according to the original developer of the customization. So, in essence, the old site hasn’t been updated in years because if that. I know, right?
The old site is fully operational, and *if things do not go as planned with the new site, they will just continue to use the old one (bad idea for a number of reasons).
You mentioned copying over tables as another option. I understand the concept there, but how would I do this…I am not very proficient on working with databases…and the old database (the one I am trying to merge in) is about 268MB in size…difficult to work with. Ridiculously huge.