Forecasting Expenses

I am fairly new with Power BI, but hoping I get some help here.  I have started using Power BI for monthly expense reporting for a large manufacturer.  I am now wanting to pivot and begin using Power BI to project current month as well as future months/quarters/full year expenses.  To do this, I need to be able to layer in actuals for MTD/QTD/YTD.  In addition, I need to layer in where the period is projected to finish.  For example, if I have $7,000 in Supplies expenses mid-way through the month, I would anticipate finishing around $14,000.  I need to be able to have full P&L expenses included, but be able to drill in to a bottom GL level.  For some of the expense lines, the full expense comes in a month-end entry, so a trend based on current expense amounts mid-period would not work.  So I would need to include the ability to use trend for some expense lines, and a 'projected' amount for others.  Can anyone help point me in the best direction to do this efficiently?