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So, the basis of a liver requires no E genes (so the horse will show as ee), and then must have at least three of the four possible markers for shading: sooty/sooty+, and Dense Pheomelanin (sp?). So you can either have two copies of sooty/sooty+, and one copy of DP, or two copies of DP and one copy of sooty/sooty+.

For Lottery, you would have to remove her E gene (swap for an e red gene) to turn the bay into a chestnut base. Since she already has two sooty genes, she would need a minimum of one copy of DP to make her liver (two copies will make a horse so dark liver that it looks black...hence, black liver is all four darkening genes together).

For Red Hot, you would also need to remove her E gene, and since she has one copy of sooty, she will either need two copies of DP, or one DP and one more sooty, to give her the minimum requirement for a liver :)

It is the "E" that keeps them from being chestnut so to start you should change that to "e".

Basically, for them to be liver they need at least three darkening genes. The darkening genes that cause liver are Sty(orS+) and DP.
So to show as liver they need to be at least hom sty and het DP or hom DP and het sty.

The first girl is hom sty so you just need to make sure she is carying her sire or dam's dp.
The second girl is only het sty so I would start by adding her sire's sty and seeing if she has either of her parents copy of DP.

D'OH! Thank you for the correction @Haltanny... I knew that and somehow it still slipped my mind. Upon closer look, I concur with you that she is at least het DP. I really should not post before I have had some sort of afternoon caffeine. 8-}

I stand corrected- it would be 1 GMT to add DP to a lined horse (provided sire and/or dam carry it already).