Hi, first go into your access data connections and uncheck the box that says "automatically retrieve data when form is opened".
Then, go into tools > form options > Category: Open and Save > Rules
You can add rules in here to check to see if the data has been set yet or not. Click Condition and select a field that gets set by one of these data connections, then choose "is blank"
Then click "Add Action" > Choose Query Using a Data Connection > Choose one of your data connections (repeat this step for each data connection) Click ok 4 times, and save.