Why? when I select objects to copy and take of different parts of the drawing, to paste them into another area, if I was not seeing all the copy screen only paste those who were in it.Is there a system variable to change this ? 

Hello jmontesmx, if it's in the same file you don't have to copy/paste, use simply COPY.

If you wanted to copy all the objects in the drawing even if they are not shown on your screen then you should have used the COPY command with the ALL option.Now, are you copying within a drawing or between two different drawings?
John Connor2015-07-02 11:50:29

The problema is in the same file Philippe, I used the word paste to describe the word "pegar" in spanish, but you are right I use only the command copy.

Thanks Jhon, I am copying only in one drawing, try as you suggest, but the whole picture is copied and only need to copy certain parts not all.This happens to me all the drawings for that reason  the question whether it is a system variable that must be corrected.

Well if you are just copying some of the objects in a drawing then you have to pick only those objects.  However, if you pick just one object but all the objects in the drawing are highlighted then you are dealing with a block that must be exploded first.Are you an AutoCAD newbie?

John, I'm not a newbie, use AutoCAD since 1995 when used with MS DOS environment.The drawing is not a block, as I said goes for all drawings, so the question whether it is a system variable.I have Autocad installed on other computers and it's not the same.An apology if my English is not very clear but my language is Spanish and I do my best to make me understand

Then you're dealing with groups.  Upload a copy of the drawing or use a file sharing service like Dropbox.  Your explanations just aren't clear enough.

Finally the problem was in the Options window, in the box selection modes in Use Shift to add to selection, for that reason passed if not select all at once, so do not take the same time without shift went off the selection.Thanks to those who tried to help.