Yes, you can purchase additional RAM, Disk space, Bandwidth and CPU resource during the VPS signup or later on when you need them. There are two ways you can order additional resources to your existing VPS.
You can always submit a ticket from the client area to order add-ons. On receipt of your support ticket, we will send you an invoice according to the resource type, resource amount and chosen billing cycle. Once you make the payment, we will upgrade your VPS services. If you still have any questions related to VPS upgrades, feel free to contact our 24/7/365 support team.