How can I based on the response from a previous table ask the user to fill a new form

[Paras_Jatana]

I am working on creating a BMI app, and this is how the process looks like wherein firstly user enter his height and weight and on the basis of the data input the BMI is calculated thats where I want that on calculation of BMI when the BMI is less than 25 a new form should be triggered wherein I can ask the user about his further details. Attached a photo wherein what deatils I would be asking the user.