Yes,Farmworks software does allow you to make your own grid maps. You can take your own soil test and import the results (Via e-mail from the lab) directly into the program. No manual entries are necesary. All soil test results are automatically entered for each soil test number in that field all at once.
From this information you can write a prescription map and it will control your spreader based on that map. The cool thing is that if once you get to the field and you change your mind(or notice a mistake) and want to apply a different amount than prescribed,you can change it at any point, anywhere, anytime you desire right there in the truck. The software does control many different types of controllers on the market.
We have been doing all this and MUCH more with FarmWorks on our farm for the past few years. It works GREAT!!!