I know you didn't say it this way, but the following formula assumes that you are putting your data starting in cell E2, F2, etc...
It also assumes that your column B data is starting in B1. It also assumes your data is regular, ie. there are (in my example) 20 separate headings that have to be filled in. ie. Exactly 20 rows/line. (I'm slightly skeptical of this, as 324 does not divide 6481 exactly, but it will be up to you to rectify.)
Just drag it across and then drag down.
You'll probably want to Copy and Paste Special -> Values afterwards.
Scott
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