how to schedule batch input sessions one after another

Hello,

SAP release : SAP ECC6 (netweaver 2004s)

I'm a SAP Basis guy, and have been asked by our developers if it would be possible to submit and schedule Batch Input sessions that were previously created on SM35.

For instance there are three BI sessions : BI1, BI2, BI3

We tried to schedule one job with three steps in sm36, each of those step would call the program RSBDSSUB with the appropriate session. But unfortunatly, the main program finished almost immediatly triggering three distincts job that submit the three BI sessions simultaneously ...

Is there a way to schedule the three BI sessions one after anoter ?

Any helpful help woulb be highly appreciated.

BestRegards.