I realized in 2D6 adjusting the Roll & Keep (roll 3D6 Keep High 2 or Low 2) is just pretier but hard to communicate.
Advantage: Any Value Can still happen but we adjust the Bell Curve or Weight Distribution of the odds.
So if I have a Level 4 Skill in Cepheus Engine and roll 6D6KH2, but i have 5 levels of Disadvantage I will NET roll 3D6KL2.
Question: Then what is the Function of adjusting the Target Number?
Answer: Fine Tuning, the Refree and Players can adjust the Odds in the Give and Take of crafting the scene. Target Numbering being the Default and ADV and DIS being a significant increase while TN having a smaller yet still tangible outcome.
So a 3-7D6 keep H/L2. will still be TN 2-12.