Here is a quick entry on how to create a doughnut gauge. These gauges provide an effective way of representing a percentile measure like a KPI. The gauge has the advantage over a Pie Chart of only requiring only one expression and can be formatted to produce a much cleaner looking chart.
Step 1: Write your expression. You dont need to use a percentage you can use a total value.
Step 2: Add a gauge chart to your document
Step 3: Configure the gauge
DIMENSIONS: No Dimensions
EXPRESSIONS: =1 (this forces the gauge to show the full circle)
STYLE: Choose the simple circular gauge.
Min = 0
Max = 1
Indicator.Mode = Fill to Value
Show Scale = untick
Autowidth Segments = untick
Cylinder Thickness = 50
Angle Span = 360
Center Angle = 0
Hide Segment Boundaries = tick
Hide Gauge Outlines = tick
Segment 2.LowerBound = Expression from step 1
Segment 2.Colour = Black
Text in Chart = Expression from step 1
That's it. You can finesse to your hearts content. If you prefer to not use a percentage then the expression and the max need to be the total of the whole measures and the segment 2 lower bound would need to be the subset's measure value (really useful for showing things like data quality scores, order completeness, etc)