Hi, I want to program on SW-D channel 7 with the following positions: 0 - 0%, 1 - 50%, 2 - 100%. I do not want to use End Point - ATV to limit to 0%.

Use the AFR for the channel. You set both RateA and Rate B to 50%. Then move the offset so that it is at 50. That puts one end of the curve at 0 and the other at 100%. You do not use "X offset".