Finding a trend line on a long term chart that price has consistently use for support and resistance is a great way to find other areas of support and resistance. Clone the line and place it on extreme levels on the chart. You will notice how price uses these levels.
When you go to a lower time frame, you will notice that you can clone these levels to find smaller levels of support.
When you go to a lower time frame, you will notice that you can clone these levels to find smaller levels of support.