How can I use a method from Fiori Launchpad in my RAP-based App?

[HadiR]

How can I use a method from Fiori Launchpad in my RAP-based App?

I am creating an App to release Billing Block from Sales Orders. so Fiori Launchpad has an App called Manage Sales Order V2 (F3893) it has a removebillingblock method defined in C_SalesOrderManage behavior definition and I want to use it in my RAP-based App.
So what is the optimal way to call this method(action) and use it in my App.

P.s I tried to trace this method with Fiori Launchpad package, It took so long and was so complicated sequence.

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define behavior for C_SalesOrderManage alias SalesOrder
use etag
extensible
{
use action RemoveBillingBlock; 

}

SAP S/4HANA SD (Sales and Distribution)  ABAP Extensibility  SAP Fiori for SAP S/4HANA