Yes, you can purchase additional RAM, Disk Space, Bandwidth and vCPU resource during the VPS signup or later on when you need them. You just need to open login into client area and open ticket with Sales Department. Just follow below step to get your resources.
Order Addons for VPS Server
As an alternate option, 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 server with the purchased add-on. You can check all add-ons being offered with VPS and their price at the bottom of VPS page. If you still have any questions related to VPS add-ons, feel free to contact our 24/7/365 sales team.