ok am trying to both subtract and add speed subtract its base speed down to 30ft which I got it so where it shows up but the problem is that I can't seam to get the burrowing speed to add if any one could help me it would be much appreciated

I’m not sure what you mean by “trying to both subtract and add speed subtract its base speed down to 30ft.” What exactly are you “subtracting,” and what are you “adding?” What modifiers are you using? How do you have it programmed?

what i mean is I want the base speed at 20 which what I have but am struggling with adding its burrowing speed and what I have is modifier<Bonus<speed(walking)<-5 

modifier<Bonus<speed(burrowing)<30

Is this a race or a subrace/variant race? Are there subraces, and if so do they have different speeds?

If this is for a base race that either doesn’t have subraces/variants, or they will all have the same speeds, then you don’t need to do any of that. Simply go under Basic Information and input the speeds there: