To add a custom attributes group:
You can set the selection of one of the attribute options as a condition required for subscription creation. For example, this option is useful for attributes that define a dedicated server configuration, when all the parameters must be clearly specified. To require such a selection, please, check the Force customer to select an attribute option box.
An attribute options listing order as it is shown on the attribute screen, defines options value (the first option is the most valuable, the last one - the less valuable). For example, for such a custom attribute as Hard Disk you can put options in the following order: 120GB, 80Gb, 40 Gb. To allow customers to change subscriptions from less valuable option to more valuable one (in our example, increase hard disk) , check the Allow upgrade box. To allow customers to to change subscriptions from more valuable option to less valuable one (in our example, decrease hard disk), check the Allow downgrade box. You can allow both upgrade and down grade as well.
After this, you can add options to custom attributes.
To add options to a custom attribute:
Please, repeat the steps described above to add as many options as needed.
To adjust an attribute options order (upgrade/downgrade):