Can Cplex generate a set from the resulted variables (i.e. not initialization)?

Question

I am currently planning a load optimization model. My desired result is 6 routes with more or less the same load assigned to them. However, i also want to impose a constraint that restricts the time spent on each route to below a certain amount.

The variable of interest is X[i][j][k] which is a boolean value, with i being the starting location, j the destination location, k the route number. For example, X[2][4][1]=1 means that the Route number 1 visits location 2 and then 4.

I only have this concept in my mind that somehow, using Cplex, we can create a set that keeps track of all the locations that cannot be assigned to a route because that route has exceeded the target time. Is such a function available on Cplex? Or how could I change my formulation to get that result? I want to use that set to assign another separate route that deals with those locations left