I think the best way to achieve this is to create a text box with a placeholder for the page number (Command+3 on Mac, Ctrl+3 on PC) on the master page. You'll see something like <#>.
Then, in the document itself, go to the page you want to start your new numbering from, and go to Page > Section... The dialog box that appears gives you a few options. Click Section Start to tell Quark that this is the beginning of a new section, and in the Number field, type in the page number you want to start from.
There are other options here too, like using Roman numerals or adding a prefix to the page numbers. Hope this helps!