Problems with IFS calculation

Hi,

Is it possible to run the IFS function logical test in 2 different cells, e.g., =IFS(A1="X",B1="Y",TRUE,"Z"). I attach a basis example of what I'm trying to achieve. I have only filled in Project 1, which works fine if the project starts in Jan or Feb (from the drop down menu in B2). If this moves on to March or later, the problems appear. 

Thanks in advance for any help. Much appreciated.