Thank you, I liked your answer (devil questioning the WF admin 
)
Actually, this WF is 3rd party add-on owned / shipped object and its damn complex hence as a newbie I don't want to touch/change it w/ a access key
So, am trying to achieve my requirement from feeder classes / BADI. In my OP I said sales orgs, but they are not static they are dynamic, it depends on the user picked sales orgs on the UI, in this example, say the user selected 1 & 2 sales orgs hence I am filtering the 3,4, & 5th sales entries / WIs from the WF
As Rick suggested I tried to get graphical pic of whole WF but system is asking 'Do you want to have High level or Current one' and seems we can't get all the WF/WIs in one screen shot, hence am here putting one complete WF SWI1 log as below, I guess now you guys will some idea about my WF (since from the beginning am referring only 1 to 5 hence here in this pic I marked just up to 5, just as an example purpose)
As a newbie my answers for your questions: Here 1,2,3,4 & 5 are independent / stand alone, neither they are dependent on each other nor on the WS00289900, WS00289901, WS00289902s (Red arrow marks), hence if I cancel 3,4,5 there will not be any impact with this cancellation either on WIs 1,2 or on WS* or the whole as a WF object, hence its OK to cancel them, only concern is unnecessary logs for 3,4,5 in the system as a junk data! this is just my rough guess ((yes, I agree that the 3,4 & 5 are generated from WS*))
Thank you