I think you would need VBA but here is a work around for a one-time entry.
Enter the numbers
Type 1000 in an empty cell
Copy that cell
Select the range of numbers and use Paste Special, specify Multiply
Delete the 1000
best wishes
If you actually want to change the number on entry, rather than format the
number as mentioned in your subject line, then you could use Tools/ Options/
Edit/ Fixed decimal places: Set to -3, but you'll need to remember to put
it back to normal afterwards.
The zeroes are in front? Like "000123" ? Then format/cells/custom ######
But if the zeroes are trailing, like "123000", then format/cells/custom/
###"000"
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