You can either use a custom NUMBER format if the length of all entries will
be the same.
For example: Custom format 00000
Then:
1 becomes 00001
12 becomes 00012
123 becomes 00123
1234 becomes 01234
12345 stays 12345
However, using this method Excel will still not recognize the leading 0's.
00001 has a true underlying value of 1.
Or, you can preformat the cells as TEXT.
Or, you can precede the entry with an apostrophe as you enter them: '00001.
This also results in a TEXT entry.
Biff