I'm want to enhance my horizons by just putting a gradient strip in isolation along the area. It's a sunset so it would be darker at the horizon lightening upwards to transparent. Any ideas how? I only seem to be able to pull a gradient from bottom up/top down etc.
Newer versions of Lightroom allow you to erase the gradient in the areas where you don't want it (i.e. below the horizon).
If you are looking for the "reflected" gradient like Photoshop has, Lightroom does not do that. The only gradient LR has is the single direction gradient.
To mimic PS's "reflected" gradient, you will need to put two LR gradients together manually.