How do you set the layer thickness to different values for different layers?

[HRDiz 0]

Many of my pieces have threads located at various levels in the part.  Is it possible to insert instructions in the g-code to change the layer thickness from a thicker value for the main body of the part to a finer thickness for the portion that has threads?  How do I do that?  Thanks,

[ahoeben 1,968]

There is no way to do this manually in Cura.

 

What you can do is slice the model at different layer heights and manually (in a text-editor) combine parts of these files. But that is tedious work and easy to screw up.