Using a Temporary Variable in PCR

Hi All
Please suggest for the following.
How can I use a temporary variable in a PCR.
Say if I need to transfer the AMT of WT 4100 to a variable like 'XYZ=4100' in PCR.....What variable I can use and what is the correct syntex for this. And how can I use the same variable for further calculations.
Please suggest.

Hi Friends
Thanks for your precious suggestions.
I understood your point but if I need to transfer the value of a wage type in a variable as mentioned below then how can I do that....
4000
OUTWPPERSB
Z1
XYZ=/102 (Value of /102 should be transfered to XYZ so that can be used for further processing. Or If there is other way to solve this then please suggest.)
Here this PCR should work only if there is a Wage Type 4000. And when it finds 4000 in Payroll and enter into this PCR then wage type /102 should be multiplied with a constant stored in T511K & the result of that should be stored in 5000. '/102' should not change.
Please suggest

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