Working with OAPs in sequential mode can be tricky.  Below is an example of what I think you are looking to accomplish.  Here are a few tips.  First, use the parabolic surfaces with their full apertures, then once things are aligned you can go back and add the off-axis apertures (in my example I’ve used two configurations, the first without the off-axis apertures and the second with them included).  Next, utilize chief-ray solves to help with nominal alignment of the on-axis field.  Once your system looks good, you can convert the solves to fixed values which locks the baseline design in place and allows for system perturbations to be investigated.  Lastly, it’s important to understand how the local coordinate system should change from surface-to-surface; in this regard it can be helpful to add display of the local coordinate systems as needed.

Hope this helps…