Request Property cumulative parameter

Hi,

We are using version 9.2.1 with the Angular Portal.

We need to configure a request property for some IT Shop items.

In our specific case, the user is requesting SAP roles but, since users can have multiple accounts, we wanted to use a request property to allow them to select the account for which they are requesting the roles. 

However, if the user needs to ask 50 roles for the same account, they need to set the request property for each item they are requesting. Is there a way in which we can allow the user to select the account before selecting all the roles to request? Or to make a "comulative" request property to avoid the user to set it for each specific requested role?

Thanks