Hi,
We are dealing with multiple cost centers, So while making any Purchase Invoice or Sales Invoice, How can I set Cost center to all Invoice Items simultaneously.
I believe you can add a Custom Script (js script) for this one that will automatically fill in the Item’s cost center to the cost center that you want. Alternatively, you can use hooks (using python) to set the item’s cost center once the document is saved. 
Thank you @littlehera, Iam doing the same way. I thought there might be some configuration setup,which automatically populates the cost center
No problem.