Plumbing Systems

My bathrooms across levels are all identical. I installed three toilets and 2 sinks for the women’s restroom and 2 toilets, 1 urinal, and 2 sink for the mens. I have cold water, hot water and a sanitary system. I made a section of wall in my bathroom to hide all of the plumbing. I had trouble tilting the sanitary pipe because it would not connect to the vertical one. It did not work until I made it horizontal and then added a slope after with the slope tool.