Calculated Revenue Line Item Amount - How to edit it?

Hello Angel, 

But default in RLI's you already have the following fields that seem quite similar to what you are referencing: Quantity, Unit Price, Service Duration, and Discount Amount. 
You could check if it's possible to adapt your business scenario to the existing ones before creating new custom fields. 

In Studio, you can analyze the default formula that the field total_amount in Revenue Line Items is using to perform the calculation with those fields. 

Hopefully, this will be a good starting point for your requirement. 

These links might help: 

https://support.sugarcrm.com/Documentation/Sugar_Versions/11.0/Ent/Application_Guide/Revenue_Line_Items/#Revenue_Line_Item_Fields

https://support.sugarcrm.com/Knowledge_Base/Studio_and_Module_Builder/Sugar_Logic/Introduction_to_Calculated_Fields/

https://support.sugarcrm.com/Documentation/Sugar_Developer/Sugar_Developer_Guide_11.0/Architecture/Sugar_Logic/

Hello Andre, thanks for your response! I have read the information on the link but I do not seem to understand how does the formulas work in the Calculated Field; I see fields that are not even declared in Studio, I supposed this fields names are directly on the code but I do not seem to find any information about this anywhere. 

I have been working into this for 2 weeks with no results. 

I hope someone can help me here. 

Thanks once again Andre.

Hello Andre, thanks for your response! I have read the information on the link but I do not seem to understand how does the formulas work in the Calculated Field; I see fields that are not even declared in Studio, I supposed this fields names are directly on the code but I do not seem to find any information about this anywhere. 

I have been working into this for 2 weeks with no results. 

I hope someone can help me here. 

Thanks once again Andre.