Instantiate element of subworkflow

Hi.

I have two workflows: workflowA and workflowB.

workflowA contains mandatory import container element obj which references to class myClass which implements interface If_workflow.

When i test workflowA with transaction SWUS i have option to set field INSTID( component of SIBFLPOR)  with some value. and execute workflowA

with instantiated obj. All works fine.

Now i want to include workflowA as subworkflow into workflowB but I dont know how to pass value from container element of workflowB

to obj as i can do it in SWUS