I want to manually select a dipole and generate a field from this to generate a spike.
Have you checked these tutorials and forum posts?
https://neuroimage.usc.edu/brainstorm/Tutorials/Statistics#Simulate_recordings_from_these_scouts
Simulate sources using brain template and CTF-275
Is there any way you would suggest doing this? I have defining source activity and creating a scout but I was unable to get the simulation of the scout to work.
What kind of problem did you have?
Can you post a precise description of what you had, what you tried to do, and what fails? Screen captures would help (ALT+PrintScreen and CTRL+V in this forum directly)