Hello All. I have a submitted a coupled diffusion stress analyses in Abaqus and currently looking at the ".odb file" showing field outputs. Does anyone know how to create a new "synchronized" output variable with Abaqus in the "Create Field Output" window (Tools->Field Output->Create From Fields)? I could not find a way to this in the examples provided in the 2017 Abaqus documentation. For example in my current .odb file, I have an output for pore pressure (POR) for 165 frames within a step. From this POR field output, I would like to calculate and output the difference between the pore pressure at any given frame of time with respect to the pore pressure of the initial time frame within the step (which i label DELPOR).

See picture (what do i put in place of the question marks ???) if Abaqus supports this feature or any thoughts on how to do this?