Select some points

[allelopath]

I want to remove the part of the corrugated pipe below the red line (see image)

I can select each point individually but there must be a better way.

I tried Quick Select with Y vertex below -55.5455 but that didn't select anything.

What can you suggest?

dwg attached

[ChicagoLooper]

@allelopath 

<<...I can select each point individually but there must be a better way...>>

I don't understand. What points are you selecting? There are no points, above or below, the red line in your drawing.

Even if there was a better way, could this better way select those points?

[allelopath]

If you click on any part of the squiggly line, it selects all the points. (Attached another image to question)

[parkr4st]

TRIM

select red line

then the Squiggly line "below" the red line to leave the portion "above" the red line?

or select "above" the red line to leave portion "below" the red line

keeping in mind below implies working along the z axis, not the y axis

[allelopath]

This is a 2d drawing. I don't understand then how the z axis is involved

[ChicagoLooper]

@allelopath 

Your uploaded drawing contains e-x-a-c-t-l-y 5 objects.

They  are:

hatch 2 each

circle 1 each

polyline 2 each

TOTAL 5 objects.

There are no 'points' in the drawing you uploaded.

If there are points in your drawing, please select them.....and while they're still selected, upload a SCREENSHOT of both the selected points and the Properties palette.

[ChicagoLooper]

<<...If you click on any part of the squiggly line, it selects all the points....>>

If I select the squiggly line the Properties Palette displays Polyline, not points. 

If you are referring to the blue grips, you're mistaken. Those blue grip are not points, they are vertices and midpoints of the ARCS in the squiggly line.

Just incase you didn't know, the squiggly line can be trimmed using TRIM command. Treat the squiggly LINE like a line, not like a bunch of Points.

[allelopath]

I mistook the grips for points. Can you outline the steps to use the TRIM command to trim the polyline, please?

I'm trying and can only trim the yellow object.

[ChicagoLooper]

Do this:

1. Start TRIM command. Go to Home Tab=>Modify Panel=>Trim (looks like scissors)=>Click your RED line=>Enter
2. Using your cursor (cursor will now be square) click the portion of the squiggly line you want to go bye-bye=>click Enter to exit Trim cmd.

[O_Eckmann]

Hi,

Set TRIMEXTENDMODE variable to 0 to work with Standard mode which is more useful, than Quick mode.

Olivier

[parkr4st · Accepted solution]

as for the  reference to Z axis.  in real life the x y plane at world ucs is horizontal.  below that plane is -z, above the plain +z, thus i call those down and up.  matter of personal reference probably.

as an alternative you could break the pline at any two points and have two open plines.

[allelopath]

I understand what you are saying about x/y/z. Though it is a matter of personal preference, I think Autocad may have its own preference. For example, if I right-click on a point and select Quick Select, in the Properties list box it has "Origin X" and "Origin Y". So it has something in mind. Whether Y is Y or Y is Z, I'm not sure.

Anyway, thanks for the suggestion to break the polyline. I used the BREAK command to do this. There are numerous ways to accomplish the task at hand (as suggested in other comments) but in this case, I found this to be the best.