How to extend and add calculated item in EO Based VO?

Hi All,
I have a requirment where I have to add few fields on the page.
These fields are based on one Custom table and few calculated columns.
The existing VO of the page is based on EO which is based on PL/SQL.
approach I am thinking to follow for custom table is -
a) Create a EO based on Custom table
b) extend the VO of the page to add New EO and its column.
c) write code in New EO Impl to insert the row.
But the thing which I am not able to figure out is how to add calculated item in VO.
I have created a PL/SQL package to return calulated item, but not able to figure out where to call this package.
Could any one please list out the approach to follow for this.
Regards,
Adarsh

If the calculated attribute is not going to be used for any business logic and just for display purposes you can create a transient attribute in the VO directly else create the transient attribute on the EO.

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