This is cumbersome but it can be done with a custom versification file. (custom.vrs)
(for more background, read the help file "how do I implement a custom versification for my project")
To omit whole chapters, put in a zero after the chapter number in section 1:, for example this will omit everything in Lev except chapter 19:
#section 1 amended chapter lengths
Lev 1:0 2:0 3:0 4:0 5:0 6:0 7:0 8:0 9:0 10:0 11:0 12:0 13:0 14:0 15:0 16:0 17:0 18:0 20:0 21:0 22:0 23:0 24:0 25:0 26:0 27:0
to omit verses from a chapter you want to include, cite them with a minus sign in section 2
for example if you want only Lev 19:1-2, 12, 18ff omit the other verses like this:
#section 2, deliberately missing verses
-Lev 19:3
-Lev 19:4
-Lev 19:5
-Lev 19:6
-Lev 19:7
-Lev 19:8
-Lev 19:9
-Lev 19:10
-Lev 19:11
-Lev 19:13
-Lev 19:14
-Lev 19:15
-Lev 19:16
-Lev 19:17
The painful part of this last part is you cannot omit a range of verses, you have to list each verse to omit individually.