Multi KPI - help site example: how to create lower measure

[mrcstmit]

On the help site there is an example of multi kpi customization.

Does anyboy know how to add in the multiple KPI the lower measure and label (e.g.:"▼26%" "from yesterday") for each main measure with different font dimension and label under the value (different setting compared to the upper setting of the main measure label) and tell me in detail how to do it? Thank you