Add new associated object to object in memory

I have a simple Group-Company-Employee data model, and I want one page where I can add Group details, then a company, then employees. I create an object using a simple microflow to start with. On my page I want to be able to add a new company, however, when using the “Create” button, it does not add a company to my Group object I have in memory.  The only way this works is if I commit the Group object when I create it in the microflow, however, I do not want to do this as users may leave the page and not want the details saved. My question, is there a way to do this without using custom microflow on the “Create” button, or using non-persistant entities?   I tried creating the other object in the first MF but made no difference. 
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