Need explantion of Cross Clone's behavior and functionality please

There is mention of the following functions however, I can find no explanation as to how these functions behave. Are you able to provide a more complete explantion of Cross Clone's behavior and functionality?

Clone settings:

•Clone, straight
•Clone, similar
Coupling settings:

•No coupling
•Clone downstream, straight
•Clone downstream, similar
•Clone upstream, straight
•Clone upstream, similar
•Cross coupling, straight
•Cross coupling, similar
Delete settings:

•Nothing
•Delete downstream
•Delete upstream
•Cross delete