Greetings Bhanu,
I'll leave working out the exact logic of the grouping to you (do you group starting by the highest frequency etc.), , as well as getting the finer details across to your ABAP programmer, but short of duplicating the Maintenance Package in another field of the Operation for this purpose to be copied to the Order, you need to go through the following tables:
In the table AFKO for your Order Number AUFNR you can reference the last included task lists on fields
PLNTY - tl Type
PLNNR - tl Group
PLNAL - tl Counter
Go through the tables PLKO, PLAS, PLPO on the above and also "Node" PLNKN to get to the entries for this Task List in PLPO corresponding to the Operations in your Order.
Make a decision whether you use Operation Number VORNR (should be fine, unless you renumber the Operations upon inclusion) or the Operation Description LTXA1 to find the operations in PLPO that correspond to your Order Operations.
Order Operations will be found in table AFVC. Join AFKO and AFVC on field AUFPL to find the Operations for your Order.
Now that you have the Operations, find the Maintenance Packages. You will find those in table PLWP, go from PLPO based on the same joins as previously. PLWP-PAKET is the Package, and PLWP-STRAT is the Strategy.
If you need to look up the data of the Strategy, join on the two fields mentioned above with table T351P