Setting up a new Salary Grade Matrix

When we set up grades, there are minimum, midpoint, maximum salaries set up for the grade. We are moving to a model where there are clusters within a grade. Each cluster will have its salary range and the ranges may overlap between clusters of the same grade.

Is it possible to set up a salary range at a level below the grade, say for example the step level? Has anyone done this and how was it achieved?

Thank you

Note: We’re trying not to change our current grade numbering scheme to minimize impact to other areas.