Yes. WP Site and WP Studio plans include additional free sub-domain sites and databases that you can use for development, staging and test sites.
You can easily create staging sites in a few clicks with the Plesk WordPress Toolkit’s Clone & Sync feature.
Cloned sites share your plan’s total disk space allocation, so you must have enough free disk space to perform a clone. You can add more disk space by purchasing a disk space add-on.