I am trying to do this on both LH and UA.

A few related questions:

Can a R/T flight be split between the two programs with each leg credited to one of the programs?

Can the two legs of a 1-stop flight (with different flight numbers) be credited to separate programs?

Do we know for sure if LH is treating Austrian and Tyrolean as two airlines? If so, does it mean that Austrian (OS) ticketing on Tyrolean airlines metal (which is the only way to fly Tyrolean) not eligible as a code share or is it counted as a leg in Tyrolean?

Thanks