Can you give an example of what exactly you try to do?

If I have a parameter named Demand that is not defined over any index domain, it means it is a scalar value, so just one value.

However, if you define a set of Customers with an index iCustomer and you define the parameter Demand over the iCustomer index, that means you have one Demand value for every iCustomer you have in the set customers.

Dear gdiepen,

Thank you for you comments.

Sorry for the unclearness of my question.
For example, I have three optimization result variables as varA, varB, and VarC. All three variables have the same index. I want to store all three variables in a parameter (like a table). Is it possible in AIMMS?
Thanks.

Yes, both in the win-ui as well as the current web-ui you can just add a pivot-table to a page and add the multiple variables as contents to this pivot-table