Update Deal using associated Product field values

1. We assume that you have 'Product' look up field in the subform of Deals module

2. Also we assume that you will add only one entry in subform

We've given the steps to update Deal using associated Product field values

1.1 Tap on Settings icon

1.2 Tap on "Workflow Rules" under AUTOMATION 

1.3 Tap on "Create Rule"

1.4 Fill all mandatory  fields as mentioned in the image and tap on Next

1.5 Choose "On a record action"

1.6 Choose the following  as mentioned in the image and tap on Next

1.7 Choose 'All Deals' and tap on Next

1.8 Choose "Function" for Instant Actions 

1.9 Tap on "New Function"

1.10 Choose "Write your own"

1.11 Give Function Name as mentioned in the image

1.12 Tap on "Edit Arguments"

1.13 Choose Param value as mentioned in the image and tap on Save

1.14 Copy  and paste the below Code Snippet and tap on Save

1.15 Tap on "Save"

Click here to see detailed steps to find API Names for Deals, Products and Vendors module. Copy and paste the API Names in the below Code Snippet if needed. 

Code to connect modules | Link