Using the points to draw lines

Hi, I am having another issue after I seek for help from this forum yesterday. How can I connect points with lines (the green cross) as shown on the attached image? Normally I go for Item List to sort out the points but it doesn’t seem to work here. I would appreciate for the help, many thanks!

Building.3dm (979.0 KB) (11.8 KB)

Check this out… (74.7 KB)

Thank you for your help Kim!