If you want to change the rewrite slug for those custom post types, i'd suggest to first take a look at wordpress.org to see if there's a plugin that let you do the change in the wp admin area.
If nothing exists, you could edit theme files but this changes will be overwritten each time you update the theme and would need to redone
edit the files
find where the custom post type is defined (search for)
then add a custom rewrite slug to the post type array
after you do the changes, remember to visit your permalink page in wp admin and save it, this way all rewrite rules will be updated.
'public' => true,
'has_archive' => false,
// add the following
'rewrite' => array('slug'=>'YOUR_CUSTOM_URL'),
You will also need to create theme template files for staff/ptable if you want to use them directly (like projects) because in Rework they are not as you would add staff via shortcode and ptables via pricing table page template