To assign the specific host with the product then Go to "System Settings" >> "Products/Services" with WHMCS admin. Edit that specific product and then click on the "Module Settings" tab. Here is the select box with the name "Select Host". Select the specific host or none and then save the changes.
If you selected as none then the module will auto get the host according to "Provisioning Setting" under "WGS VMware" addon module.
