We monitor customer revenue with a custom field, that is updated every day (history tracking is activiated). 
Whenever the revenue falls below a certain percantage threshold I would like to triigger an alert email or task. 
I found out that i can use <after update> for custom fileds but am quite lost on the next steps. 
Thanks for your help! 
 

We monitor customer revenue with a custom field, that is updated every day (history tracking is activiated). 
Whenever the revenue falls below a certain percantage threshold I would like to triigger an alert email or task. 
I found out that i can use <after update> for custom fileds but am quite lost on the next steps. 
Thanks for your help!