Hi Laney,
When we uploaded our budget, we only put in monthly amounts and the Phocas support team run a script to split it by working days for each month, I do however have to go in and build the working days calendars, I need to do 6 per year as we operate in 6 different states and they can have different working days each month. This then allows us to compare our daily sales amount against a daily budget amount as illustrated in this thread.
Feel free to ask any questions, happy to help. 