How to call a flow from within a flow ?

Hi Team,

I have a requirement to generate 2 different HDL files using 1 single flow. The parent flow uses the UCM# as a parameter which is generated over content server when flat file's is placed. I want to use the same UCM# in another flow as the parameter and create a parent - child relation between both flows so that child gets automatically submitted via parent. I have developed 2 different Fast formulas and flows. Only, unable to link both flows and also have to use same UCM number in both.

Please suggest.

Thanks