When extracting Dacpacs it's quite straightforward to go through the UI and extract, however what if you want to do this for more than one database, or automate the process for a build? The sqlpackage.exe enables us to extract a dacpac in silent mode. Below is the command, and I will go through each parameter:

"C:\Program Files (x86)\Microsoft SQL Server\110\DAC\bin\sqlpackage.exe" /action:Extract /OverwriteFiles:False /tf:"C:\Users\richard.lee\Documents\dacpacs\dbname_Baseline.dacpac" /SourceConnectionString:"Integrated Security=SSPI;Persist Security Info=False;Initial Catalog=AdventureWorks;Data Source=SQLA"

Some you need to be wary of: