I'm not so sure of your question, and the solutions.
If the things don't work out then perhaps some more
information might be needed. Even if you got what you wanted
then please tell use what solution and perhaps a little more
information as to what you actually had.
530.200
530.210
530.224
Group B Numbers
530.2
530.31
530.224
What do you have now displayed, what do you have for
a format, what do you want. Exactly why do you ask the
question. Do you have numbers other than 3 digits before
and 3 digits after the decimal point.
What do you see if you use =ISTEXT(A1)
What do you see if you use =LEN(A1)
If you want to convert numbers to text as 000.000
Your helper column might have a formula like
=TEXT(A1,"000.000")
If you want to convert what you see as you now see it to
text you can use a macro using ".text" instead of ".value"
If you can simply put a single quote in front and hit enter,
you should be able to format the column as text