Upload those instructions, I think @medeek maybe able to help to decipher them. But I do think the slab is pulled down rather than up. However despite this, the gird, plan outline can be moved. There is more than one way to work in SketchUp, no absolute correct way, there is no fail if the result is correct.
I am sorry,I misunderstood.
This problem was resolved thanks to your support.
Thank you for teaching me so patiently.
Glad to help, any further problems, send video and will reply same with fewer words, hopefully will not loose in translation.