How do you cut a line when there is already a line of code made to cut it?

Questions
1

I was gonna make something in demos when I needed to cut a line in half, after I did that I wanted to cut it again but it wouldn’t let me because the code that I made was already stopping it from adding a new code for cutting it.

Here is an image of the code

image
image1366×630 51.4 KB

I wanted to change the y < 0 code to have another cut point but then it wouldn’t let me. I tried searching on google but there were no results as well, Can anybody help?

2

If in interpreting this correctly, try something like this in the braces to set a minimum and maximum restriction.

{-5<=y<=0}
3

Thanks for the explanation I can use this for school work.