Need Help]How to Add Items to Drops] !!

Hello
I need someone who can explain to me how we can items to drops ....for all mobs or for just 1 boss....
I never tried to do it so....
Thanks in advance

first there are two tables responsable for it

drop group resource
monster drop table resource

the mob first see the monster drop table resource by the droplink table in monster resource

after it get the number it searches the monster drop table resource for that number
IF FOUND IT IT SEARCH FOR THE PERCENTAGE AND DROP
IF NOT FOUND THERE WILL BE NO ANY DROP

AND AFTER IT LOOK FOR PERCENTAGE IT SEE THE NUMBER
IF THE NUMBER BEGIN WITH - IT GO TO THE DROP RESOURCE AND SEE IF THERE IS ANY DROP
IF NOT IT DROP THAT ITEM

I didn't Really understand all
Can you Explain to me STEP by STEP please

ولكم باك أندرو

ty ^_^