remove all lines from the boxes by one command

if any one knows any command that i can remove /trim all the line from the square boxes . I like to do one selection of all boxs and then use ( if any one have this command) this command delete all.

I used trim/extrim command but i have to do selection each boxes seperately.

i attached my copy

remove.dwg

sorry I can't see your dwg on this computer, but are you looking for WIPEOUT?

I am not looking for wipeout, i have lots of stormwater pit . the lines go through these pits . i like to select all pits and use one command ( if anyone have) to delete all the inside part of the lines which passes through the pits.

not whole lines, only part of the line which is in the pit.

my attached copy is fine. today i downloaded i is fine.

It almost sounds as though you're looking for an extended trim command. Have you taken a look at EXTRIM?

EXTRIM explained:

http://autocadtipoftheday.com/tipblog/?p=332

with extrim you would have to perform the command seperately for each pit as oppose to doing a multiple selection of all pits and perform that command in one swoop...i don't think there's anything that acad can do natively so it looks like a programming job in either lisp or vba...