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Brian  Sub and secondary have totally different contexts. A sub page is  utilized where you wanna display/ capture similar information  for various entities, for example, capturing an address, for a  company or for a person, would need similar information like  street address, state county, country etc.. In those situations  a sub page would be used, to design once and reuse at multiple  places. 
A Secondary page is used to display/ capture secondary  information about an entity. A secondary page could use various  sub pages, but the reverse is not true. 
For your case, I don't see any usage of either of the pages as  you said its a custom component used to display multiple fields  information on several pages, I would go for a subpage having  key information displayed on the top of each page and then show  relevant information on subsequent pages. 
Hope this helps!!

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Modify Person is built using multiple "normal" pages (not sub or  secondary pages). 
Sub page is generally used for reuse; i.e. you have the same 4 fields  appearing the same way on several different pages. Then you'd use a  subpage with those fields and include the subpage in all those pages. 
Secondary page is used mostly as a pop-up type page to show additional  information or to collect additional information. 
For your requirement, I'd simply use a component with multiple pages  (just like the Modify Person). 
One alternative is to make use a grid (if you are going to show data in  a grid) and you can use tab separators to show multiple tabs within the  grid (don't know what tools you are on but in later tools this is an  option).