Ensure you are on a dashboard (not created from a template).
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Click the menu located in the top-right corner of the screen.
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Select 'Add Visualization' -> 'Create new gadget'

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In the 'Create new gadget' window, select 'Time Series' as the gadget type.

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Enter a name for the Time Series chart gadget.
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To display an existing metric, click 'Add Metric' and choose from the list of pre-defined metrics.
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Alternatively, you can create a new metric specifically for this gadget by clicking on 'Create Single-use Metric.'
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Select the interval (e.g., weeks) for trending the chosen metric(s).

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Set the default date range for your Time Series chart using the date picker
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To display the comparison period on the graph, select the desired comparison option from the dropdown.

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If you wish to set up a report to drill down to from this gadget, select a report from the dropdown located in the top-right corner.
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Once you've configured the default date scope, run time filters & scope filters, click 'Save'.
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The Time Series gadget will be added to the bottom of your dashboard. Scroll down if needed to re-position and resize the gadget as required.
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Select the field that you want to group by under 'Dimension B' as shown below
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For example, you can plot 'Total Miles' for each unit div over time.

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Create a bar chart

Create a stacked bar chart

Create a pie chart