There are 2 types of indices trendlines - upwards trend-line & downwards indices trend-line. Guide of how to draw indices trendlines for upward trend & how to draw indices trendlines for downwards indices trend is illustrated:
How Do I Draw Trendline for Intraday Trading
To draw an upwards trend line we use support zones. To plot upwards indices trend line correctly 2 support areas are used as displayed on the upwards trendline illustration expounded & shown - How to Draw a Trend Line for Intraday Trading.

How to Draw Upwards Trend Line
How to Draw Trendline for Intraday Trading
To draw downward indices trendline we use resistance zones & to draw downwards indices trend line correctly 2 resistance areas are used just as is illustrated on the downward indices trend line illustration expounded & shown below - How to Draw a Trend Line for Intraday Trading.

Drawing Trend Lines on Charts: Steps for Downward Lines
How to Draw Trend Lines for Intraday Trading
To illustrate Trendlines for intraday activities on MT4 Stock Charts, utilize the drawing functionality provided within the MT4 Stock Chart drawing tools specifically for Trendlines.
The MT4 trendline drawing tools used to plot indices trendlines in MT4 are located on the MetaTrader 4 drawing charts tool-bar within the MT4 platform software, To find this MetaTrader 4 charts drawing tools tool-bar if it's not activated in your MT4 platform software, Click "View" Just Next to "File" menu on the top left corner of the MetaTrader 4 platform software & click "View", Then Click on "Indices ToolBars", Then Tick on the "Indices Lines Toolbar" by pressing on it - Stock MT4 Draw Trendline Tools for Intraday Trading - Stock MT4 Trend-Line Drawing Tools.
Here's how the MT4 trend-line drawing tools appear on charts, showing how to use the indices toolbar. To add trendlines to an indices chart, use the indices trend-line tool, then click to choose where to start your upward or downward indices trend-line.

How Do I Draw Trendlines for Intraday - How to Draw a Trend Line for Trading Within the Day for Intraday Indices Trading
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