@Sanjeev Kumar Anjineyappa this is not possible in a generic sense, but some Assistants do allow you to specify parameters on the URL itself.
One such example is: /main/ifsapplications/web/assistant/CreateFaultReportAssistant/FaultReportWizardAssistant
See more on this thread:
https://community.ifs.com/ifs-assets-employees-partners-only-157/gis-object-configuration-for-linear-asset-38738Are you trying to do this with /main/ifsapplications/web/assistant/Request/NewRequestAssistant?
if so, it does seem to support passing in the Customer ID and Location ID among other things. So if your external app has those, you can try passing it in like this:
/main/ifsapplications/web/assistant/Request/NewRequestAssistant?$action=InitConfig{CustomerIdNew:'REPLACE_WITH_CUSTOMER_ID'}
Check out the full list of available parameters on the code file reqmgt/model/reqmgt/CreateRequestAssistant.fragment
more general info here: https://docs.ifs.com/techdocs/24r2/060_development/022_user_interface/030_aurena_dev/130_aurena_component_reference/100_pages_and_structure/100_page_types/010_assistants/assistant/#setup
Best regards,
Rukmal