Upstairs partitions preserve snapping to downstairs – how do I preserve wall factors on the identical degree? – SketchUp

any assist appreciated – when drawing upstairs partitions some factors snap to the degrees beneath. How do I preserve all wall factors on the identical degree? Thanks guys! xoxo

With out seeing what you’re doing, and what you get… I solely give some basic advise.
It’s worthwhile to get acquainted how Sketchup inference is working (inference sorts, discovering and locking the fitting inference … and so on.)

You can begin to see some fundamentals e.g. right here:
Introducing Drawing Fundamentals and Ideas | SketchUp Assist

There’s a YouTube channel with loads of tutorials:
SketchUp – YouTube

Or the Campus:
SketchUp Campus