CMOD User Exit Variable ABAP Logic

Hi Experts,

I am in process of writing a logic for user exit variable in CMOD,As I am not expert in ABAP struggling to implement the logic to meet the requirement…probably to meet the requirement need to execute Loop inside loop….Please advise logic to define to meet below requirement

This user exit variable is created on 0PROFIT_CTR

IF i_vnam = 'ZXXXXXX'.

  LV_USER = SY-UNAME.

*Get the data from ZPCTRUSER Master Data Table for Relevant User
*This is the table consists to which Node a User is Authorized

  SELECT /BIC/ZPCTRUSER
  INTO TABLE  IT_STORES
  FROM /BIC/MZPCTRUSER
  WHERE /BIC/ZUSERNAME = LV_USER AND
        /BIC/ZPCTRUSER <> ' ' AND
        ( DATEFROM <= SY-DATUM AND DATETO >= SY-DATUM ).
  IF SY-SUBRC = 0 AND NOT IT_STORES IS INITIAL.

*Get the data from Profit Centre Master Data Table

    SELECT * FROM /BI0/MPROFIT_CTR
    INTO TABLE  IT_TPCTR
    WHERE PROFIT_CTR     <> ' ' AND
          OBJVERS        =  'A' AND

          ( DATEFROM <= SY-DATUM AND DATETO >= SY-DATUM ).

At this point both IT_STORES and IT_TPCTR are filled with data.

Requirement

IT_TPCTR is an internal table similar to structure of 0PROFIT_CTR and filed with all valid Profit Centre Master Data in the above select statement, Consists of fields Business Segment(L1),Sub segment(L2),Contract(L3),Business Site(L4), Managing Directory(L5), Regional MD (L6) ,Account Director(L7) & Account Manager(L8).

Now requirement is fill another Internal table IT_XYZ with profit centre values by reading IT_TPCTR for each entry in IT_STORES and pass it to variable - L_S_RANGE-LOW  and where

Read IT_TPCTR-Business Segment (L1)  = IT_STORES-/BIC/ZPCTRUSER
If entries found fill IT_XYZ

Read  IT_TPCTR- Sub segment(L2) = IT_STORES-/BIC/ZPCTRUSER
If entries found fill IT_XYZ

Read  IT_TPCTR- Contract(L3) = IT_STORES-/BIC/ZPCTRUSER
If entries found fill IT_XYZ and then
.
.
.
Read IT_TPCTR- Account Manager (L8) = IT_STORES-/BIC/ZPCTRUSER
If entries found fill IT_XYZ and then

(Total 8 Reads, The read has to be performed irrespective of entries found or not found…if found then keep on filling IT_XYZ) and finally pass the Profit centre values to variable - L_S_RANGE-LOW


Please advise.

Thanks in advance