A detailed explanations and guidelines on creating and modifying custom documents layout are provided by Microsoft Dynamics 365 Business Central within Set up Microsoft Dynamics 365 Business Central for reporting learning path:

Creating and modifying document layouts

You can find necessary information on the link below:

Create and modfiy custom documents layout

Update report or document layouts

You can find necessary information on the link below:

Update report or document layouts

Change which layout is currently used on a report

You can find necessary information on the link below:

Change which layout is currently used

Implement report selections

Implement report selections

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