How to Parse Characters?

Hi Folks,
Can anyone help me out on how to parse the characters in data services. Here is the example:
Rule: Parse first three characters MU_1000008 to 1000008
What is the function I can use?
Any help is appreciated.
Thank you

Hi,Dear All,
I am Trying to go from
Id
LS001
LS003
NT006
LS007
ES009
LS004
TO OUTPUT
Col          ID
T1          LS001,ES009,LS003
T2          NT006
T3          LS007,LS004
pls help me out or give me hint or idea so i can use that.
Regards
Varsha

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