Hello,

Yes, the page will be overwritten. If you want to save the content of the current page and import the same page again, save the template in WP Bakery Page builder:

1. Enter the page editing mode and save template http://prntscr.com/jq74pz

2. After you have imported the page you will be able to add this template in the bottom of the page and remove the rows you do not need. http://prntscr.com/jq75w1

You can also save a row with your categories as a template and then paste it: http://prntscr.com/jq765p and http://prntscr.com/jq768f

You can insert your saved template to any page.

Best Regards