How can I use Excel to find multiple optimal solutions?

I want to know how to use Excel Solver to find out if a problem has multiple optimal solutions, and if so, all the possible optimal solutions. For example: I have many cubes with a total volume of 2014 cubic cm. How can I find out the minimum number of such cubes with total volume of 2014. Also, how to know if this problem has multiple solutions, and if so, all those optimal solutions.