Setting as ParentId in Smartsheet from MS Form submission

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Hi Experts,

I would like to ask for guidance on this one.

I am currently building a connection from MS Forms to Smartsheets

And here is the simplified table that I need to insert to Smartsheet.

	Invoice #	Type	Vendor	Amount
Parent	1234	Internet		1000 (Total amount)
Child			Telus	500	Invoice Line Item 1
Child			Rogers	500	Invoice Line Item 2 and so on...

I am thinking  of creating a 1st form then submit to smartsheet as a parent row.

Then I will need to have child rows inserted but that child MS Form will be dynamic depending on number of line item/s

Can you please help me on how to establish the flow, still new in this API call and flow.

Your help is very much appreciated.     

Smarsheet Connector