[I would like to know please how it is possible to add boundaries lines on a part of my sim?]

 Rolig Loon and Alwin Alcott..I answer from this account simply because "answer" option as i see is gone.also I can not answer my own question...facepalms...anyway. Rolin Loon I own whole sim so that shouldnt be a problem Alwin Alcott ..I already checked the knowledge base and couldnt find the answer which is why I asked here .but ty anyway