As for the moving the internal expense bucket from project to BAU and vice versa, you need to get the approval from K. Nikhom and Pat can work with F&A to switch the bucket.
As for the April, please urgent review the billings. I would not suggest to hold the April billings as this will impact the expense for the first half, it’s F&A thing. You have time until the end of this month to provide the response.
If we would like to save the cost, we need to control the resource FTE, we can’t reserve and let the whole team working on the project. BAU doesn’t have budget much to transfer the cost over. My 2 cents.