This sticky explains how to stack the numbers in a cell when you get more than 1 test in an hour:
https://www.felinediabetes.com/FDMB/threads/how-to-use-the-spreadsheet.241653/
"More Advanced Recording
Sometimes it is necessary to stall at PS if the BG is too low to shoot and tests are taken every 20-30 minutes apart and must be recorded. The BGs are then “stacked” as shown below and, in this case, recorded in the +11 column so the PMPS, which was at +14 can be recorded in the PMPS column:

The above tells anyone looking at the SS that testing for PMPS began at +11.75 but the BG was too low; subsequent testing every 15 minutes occurred until the Caregiver felt the BG was safe enough to shoot at +14.
Additional testing might also occur during the cycle and should be recorded as shown below:

In the example above, the first test of 103 was taken at +2 followed by another test (57) at +2.5. Two tests were taken from +3 to +4 and are recorded in the +3 column. Two tests were taken from +4 to +5 and are recorded in the +4 column; two tests were taken from +5 to +6 and recorded in the +5 column. The last test was taken at +6 and recorded in that column.
It will be necessary to manually color in the cells when recording more than just a whole number in the cell. To do this:
- record the data in the correct cell (e.g. 185 @ +3.25)
- select the color from the ranges at the top of the SS which coincides for the test (e.g. 185 would be blue)
- in the SS toolbar at the top, click on the icon which looks like a pitcher which should also show the text “fill color” when you move the arrow over it
- next, in the SS toolbar at the top, click on the underscored A to the left of the pitcher; this should show the text “text color” when you move the arrow over it."