Could anyone help me with an analysis using SPSS v22?

My problem is: I have a dataset of approximately 12000 people. In my analysis, I divided the entire sample into three different groups: Group A (n=6000), Group B (n=3000), and Group 3 (n=3000). I performed a multivariate analysis and we found 2 variables mediating the association. However, the reviewer have asked me to perform a confirmatory analysis creating three numerically identical groups of participants of different Groups but matched for major confounders (those 2 variables we found to mediate the association) and then test for differences in the dependent variable.

Is it possible to do this analysis using SPSS v22?

Thanks.