Selecting doc/spreadsheet templates based on dropdown selection

[Rajarshi_Basu]

Suppose I want to Create an RFI or Submittal where I have to select and attach multiple files linking to one particular job or activity. For eg:
ACTIVITY CHECKLIST

1. RCC work- PCC checklist,Reinforcement checklist,Formwork checklist,Pre pour Inspection checklist etc [ My template checklist is in spreadsheet format as it is easy to create compared to doc when it comes to checklist]
2. Flooring work- Curing checklist, Level Inspection checklist etc
   In other words,I will have a database of templates and I wish to use them as and when applicable based on the Activity I select from my dropdown. I want a attach button to attach the files and then export the pdf to my manager through a approval workflow.