Waste Pipes Need Moving for Conservatory Construction Drainage and wastage systems and plumbing help, advice and answers

[Nerdynovice]

One of the waste outlets.

I have a couple of external waste pipes that likely go to the septic tank but I want to build a conservatory so these need to go but I am not sure where. I assume I need to redirect them but what are my options for the remaining open waste pipes?

Thanks