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Ugochukwu Nwuwa 7Ugochukwu Nwuwa 7 

Create a Custom Object for deductible amount field

I created an additional field to help me achieve the above goal but looks like I'm missing something and would like you to take a look.

The flow is a follows:
Note: the "Billiable Budget Field = 100,000" is a preset field where the deductions will take place.
When a user creats a CER (eg CER Type = IT, subtype = Strategic, Total = 20000)
a) I used a formula to deduct the "Total field" from the "Billable budget field" which is now the "Budget Field CER = 80000"

Now when a another user creates a another CER, on the new CER page, I want the "Billable Budget Field = 80000 
And the deduction will happen again depending on the new Total field. This I want to automate but when i created a new CER, the "Billable Budget Field was blank.
Ugochukwu Nwuwa 7Ugochukwu Nwuwa 7
Hello All, wondering if anyone can assist. Thank you so much