Reruning the model in one simulation

Hi,

I have a model simple model (comprising of spheres connected with springs). I want to run this model several times in the following manner:
1). Apply a force to certain nodes and get the reaction forces and new displacement
2). Have all the nodes return to the original position
3). Apply a force to certain nodes (different from 1) and get the reaction forces and new displacement
4) have all the nodes return to the original position
5) ....
and so on.
Ideally I want this to be as one script and not create multiple scripts and then combining the result. Is there a way of doing this? If I can know how to reset the model (bring all the nodes in the initial position and have no residual forces), I can create functions based on iteration numbers and script it.

Thank you so much for your help.