Google Sheets - Array Formula -

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okay i'm trying simple yet still boggles me.

in column a, have subsections or categories (1 / 2 / 3) etc. in column b, want setup arrayformual following. column a, , grab last subsection used. works when copy , paste formula in each row, want setup array automatically fills out sheet.

=arrayformula(  index(  indirect("a$1:a" & row()),  match(9.99999999999999e+307,indirect("a$1:a" & row()))  )  )

link: https://docs.google.com/spreadsheets/d/1obpnq2teoif9ycgxshztonqv1azpcvcf15dhzc-eaxa/edit?usp=sharing

maybe somehting this:

=arrayformula(if(row(a:a) <= max(if(not(isblank(a:a)), row(a:a))),vlookup(row(a:a),filter({row(a:a),a:a},len(a:a)),2),))

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