Cash or Cheque received from Customer

I have started working on Manager software 2 days before. I have entered my all customers data before the set up date as Sales Invoice . So all the customers receivable amounts showing under Assets —> Receivables as I wished. Actually today also I made some credit sales I entered data in Sales invoices also I have received some cash and cheques Where Should I enter this data as Cash/ Cheque received under
1st Invoice( Where I entered before set up date means receivables) or recent Invoice. Please Kindly give a detail explanation.

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Thank u so much