How to populate blanks in a column with last non-blank cell
I have a spreadsheet of data on Google Sheets where one order is spread over several rows, however, only the first row contains all the information. I need a way to copy the last populated cell down into all of the blanks.
So it looks like the left, but I need it to do what's on the right:
GB GB
- GB
AU AU
- AU
- AU
I've tried every formula I could find online, but they all either don't work or require pasting into every blank cell. This spreadsheet could reach 20,000+ rows, so I really need a formula that will do this automatically. I don't mind if it duplicates the whole column into a new column using an ARRAYFORMULA, I just need it to contain all the correct data.
To summarise, I want a formula that will take an entire column of a spreadsheet and populate every blank cell with the value in the last populated cell above it.
=ARRAYFORMULA(IF(ROW(A2:A) <= MAX(IF(NOT(ISBLANK(B2:B)), ROW(A2:A))),
VLOOKUP(ROW(A2:A), FILTER({ROW(A2:A), A2:A}, LEN(A2:A)), 2), ))
or remove NOT
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