Are you looking to dynamically choose which fields you wish to display in the portal?
If so then yes, but you'll have to build the functionality (unless there is a plugin).
You can do this by displaying calculation fields in the portal and then their content will be based on the selction you make.
Eg you display a field "Field 1", you select from a drop down that this is to contain the company name and the calculation in Field 1 then pulls in that value.
A type of calculation field would work or
It seems that you may want filtered/conditional value lists. http://help.filemaker.com/app/answers/detail/a_id/5833/~/creating-conditional-value-lists
Which require a relationship between two table occurences. Here are a few links to help: