Thanks for your reply.
Yes, we are using a CRM but I would know is there any section available in marketo interface where we can create groups like sales group or support group and then assign that group to any specific form lead assignment section.
You will have to create queue in SFDC and then assign leads from MKTO to the queue. There is no way in MKTO to asisgn leads to a flow. If you want, you can create a flow with choices to assign a group of leads to each Sales rep individually from MKTO directly.