Moving loads with load combinations

Hi,

I am wondering if someone could advise me as to how to combine the moving loads with other loads in the analysis.

I have a beam with moving loads. the other loads being self weight and a UDL of 100kN/m.

Because moving loads generate multile steps (say I have created 20 steps) therefore if I form a combination and ask moving load to be combined with other loads then StaadPro will combine 20 no. moving loads with other loads. Therefore effects of moving load will be considered 20 times!!

Is there a way to combine WORST output from moving load case with other applied loadings?

Please advise. Model is attached.

Thanks.