Hello!
I guess it depends a bit on how you want to use those indexes.

In one scenario, let's say your original parameter is p_resourceAvailable(i_category,i_time) and you want to use the indexes to restrict another parameter, for example, p_resourceLimit(i_category,i_time), you can simply use p_resourceAvailable in the index domain of p_resourceLimit, somthing like this:

Set s_time {
	Index: i_time;
}


Set s_category {
	Index: i_category;
}


Parameter p_resourceAvailable {
	IndexDomain: (i_category,i_time);
}


Parameter p_resourceLimit {
	IndexDomain: (i_category,i_time) | p_resourceAvailable(i_category, i_time);
}

So, limiting which combination of indexes will be used in an index domain, sum, a for loop, etc. can be done by using the original parameter.

Is this what you are seeking?

If not, can you share more about what you intended to use the index for?