To call dinamically a package located at the filesystem, you can do that inside the package (1) or from a bat file (2)
1. From a bat file
Create a bat file and add the following code: (replace MyPackageName by your package name)
set OLDDIR=%CD%
dtexec /F "%OLDDIR%\MyPackageName.dtsx
2. From a SSIS package
Add a script task to your controlflow, create a ssis variable uvRootFolder, set the variable name inside ScriptTask in the ReadWriteVariables and add the following code to it:
I hope this tip help you! PedroCGD