Need help on how to collect and summarize data

Need help on how to collect and summarize data

Hi

I have create one form named Flow in wich my users add entries.

I am stucked trying to create another form named Rend, wich will be populates with records from Flow , this records must comply 2 conditions ,

1. the day must be the same as the day entered in Rend
2. the operator must be the same as the entered in Rend

Once collected some numeric fields will be summed and later must be used for other calculations , like this.

USD initial amount + (totalofincomes) - (totalofexpenses) = final USD

totalofincomes = total cash from one day and one operator
totalofexpenses = total cash from one day and one operator

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I have the Flow from done and works just fine
I can just not figure out how to collect the data from this flow based in my 2 conditions , this must be made in a way that permits further formula fields stated above.

Any help will be greatly appreciated