See the Pen
Nested Slick Slider by Jason Sims (@JasonMSims)
on CodePen.

Vertical Slide #1

Horizontal Slide #1

Vertical Slide #1

Horizontal Slide #2

Vertical Slide #1

Horizontal Slide #3

Vertical Slide #1

Horizontal Slide #4

Vertical Slide #2

Vertical Slide #3

Vertical Slide #4