It is possible to create one PDF file that contains several files. Suppose you want to send someone several PDF files by email and you want to combine them into one file so that when the user opens this file they have access to several PDF files inside. They can then choose to open each file one by one. This is a portfolio.
To do this, you create a portfolio. How do you create a portfolio? In Adobe Acrobat 9, go to Combine -> Assemble PDF Portfolio. Adobe opens up another interface that is a convenient working environment. What is the difference between a collection and a portfolio? A collection is just a series of pointers to a series of PDF files on your computer or across the network. It is a convenient feature for working with several PDF documents.
If you are using Adobe Acrobat Pro 9, click on the Modify button. Here you can add PDF documents to your portfolio. If you are using Acrobat Pro DC, choose File -> Create – > PDF Portfolio.
In Acrobat Pro DC, click Add Files and browse out to select the files you want to add.
Here is the interface, reduced in size, of Portfolio creation in Adobe Acrobat Pro 9. On the right hand side there are several options that you can set. You can create a opening page and so on. However, when you ssave it and open it with Adobe Reader DC, you don’t see all those fancy layouts and header pages.