Insert a Number to certain fields in EXCEL

I have a spreadsheet "attached" of "Ring Numbers"
The problem I'm having is the data starting with a "R4" and an "R5" need a "1" inserted in between the R and the 4 and also the R and the 5.
For example
"R4142" needs to be "R14142" & "R5507" needs to be "R15507" in order to be joined with another dataset
I am having issues isolating these specific fields only and entering the "1"
RingUtilization.csv
Jonathan MoriGIS SpecialistAsked:
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NorieAnalyst Assistant Commented:
Not sure what approach you want, formula or VBA, but here's a formula you could put use.

=IF(OR(LEFT(A2,2)={"R4","R5"}), "R1"&MID(A2,2,1)&MID(A2,3,LEN(A2)),A2)

Insert a column after column A, put that formula in B2, copy down and then do a copy/paste special values.
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Subodh Tiwari (Neeraj)Excel & VBA ExpertCommented:
You may manually replace R4 with R14 and R5 with R15 if it'a one time process. Otherwise the similar functionality can be performed with the help of a macro.
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Jonathan MoriGIS SpecialistAuthor Commented:
Subodh! So simple yet effective. Looks like I was way overthinking it... But Norie's is great also, because I might have to do it on additional sheets. Thank you!
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Subodh Tiwari (Neeraj)Excel & VBA ExpertCommented:
You're welcome GravitaZ24! Glad you found it useful.
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