How to declare a variable in Custom column formula?

I'm adding a new column and I have a formula like it:
if Text.Length(Text.Replace(Text.Replace([Text], "-", ""), " ", "") ) = 4
then "CB0" & Text.Range(Text.Replace(Text.Replace([Text], "-", ""), " ", "") , 2)
else Text.Replace(Text.Replace([Text], "-", ""), " ", "")
i want to do something like it:
string = Text.Replace(Text.Replace([Text], "-", ""), " ", "") )
if Text.Length(string) = 4
then "CB0" & Text.Range(string, 2)
else string

The issue you have is that you haven't output 'string' anywhere. You can create a column with the manipulated text and then reference that column when applying the if statement.
let
Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
String = Table.AddColumn(Source, "ReplacedText", each Text.Replace(Text.Replace([Text], "-", ""), " ", "")),
AddColumn = Table.AddColumn(String, "EndResult", each if Text.Length([ReplacedText]) = 4
then "CB0" & Text.Range([ReplacedText], 2)
else [ReplacedText])
in
AddColumn

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