If you want to add a field from the Call Reporting record to the associate Task, you can add a formula field to achieve this. The following is an example of pulling the Call Direction field onto the related Activity.
Steps
From Setup, navigate to the Activity object.
Create a new formula field.
Label your new field and select the formula return type of ‘Text’
For the formula creation, select ‘Advanced Formula’
Click ‘Insert Field’ and find the related ‘Call Reporting’ record. Select the Call Direction field and select ‘Insert’
Add TEXT(examplefield) around the field


Set field permissions and page layout as desired.
Save!