You can use horizontal line objects for that. You can access the High and Low values of any timeframe using CopyHigh() and CopyLow().
Documentation on MQL5: Standard Constants, Enumerations and Structures / Objects Constants / Object Types
- www.mql5.com
Standard Constants, Enumerations and Structures / Objects Constants / Object Types - Documentation on MQL5

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Can anyone help clarify how to plot last month's (march) and last week's high-low on a chart?
Thanks
Nick