Yes, you can choose for each subdomain the website type individually. After creating the subdomain, you can choose
- Linux/Apache
- Website Alias (yes/no)
- Website forward (yes/no)
- Domain parking (yes/no)
Furthermore, you can choose the PHP version for each subdomain individually under the tap "Advanced".
Here is a guideline how to create subdomains through your Servage control panel:
https://helpdesk.servage.net/593988--How-to-create-a-subdomain