AIC and hierarchical regression


I used the AIC method for model selection under generalised linear models in SPSS. I then entered the DVs which made it into the model into a univariate analysis to get the effect size (adj R-squared).

I would like to know how much of the effect size is accounted for by each variable. Is it okay to enter the model selected from the AIC method into a hierarchical regression so that I can see changes in effect size??

Thanks in advance,