You may use one of these options:
1- for each project, change the target dll.
In the project properties, select the Linker options, then General, and change the "Output File" box. Be careful to change this for all configurations (not only Release or Debug).
Just be aware that changing this might change the .lib destination folder as well, so you might have to change the linking options for the projects which need to import the .lib files.
For your information, the destination .lib can be found under Linker, Advanced, "Import Library"
2- for each project, add a Post-Build Event to copy the required files to the destination folder you want.
In the project properties, select the Build Events options, then Post-Build Event, and edit the "Command Line" box. Add something like
copy "$(TargetPath)" "yourDestinationFolder"
You may optionnaly add a description. This description will be displayed in the output window during the compilation.
Be careful to change this for all configurations (not only Release or Debug).
With this solution, .dll and .lib files are not changed.