I am trying to sum data as of XX/XX/XXXX of each week. I want this data then to go into a cell and not be changed the next week. For example, on 1/15/24, a sum formula was used to calculate the number hours remaining was 3891. On 1/22/24, the sum formula was used to calculate the number of hours remaining as 3201. Is there a formula that will allow the 3891 to stay static on for 1/15/24 and not change without touching the sheet? Then on 02/19/24, I want the sum formula to run and pick up the number and remain static.