Assuming that the old number is in A1, formula in another cell:
=SUBSTITUTE(A1," ","-")
If you just need to replace existing value by a new one, use excel's find & replace functionality (search for " ", replace by "-", without quotes) for a selected range.
F1 is your friend!
You have those two values in two columns, say A1 and B1, right?
=>in C1:
=CONCATENATE(A1,"-",B1)
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