To add existing submittals from the submittals log:
In the Project View, expand the project you are working in.
Expand the Logs folder and click Submittals to open the Submittals Log Window.
Click Edit document next to the submittal to which you want to add to the package. The document will open in Edit mode.
On the General tab, click browse next to the Package field to open the Select Submittal Package Dialog Box. Select the submittal package to which you want to add the submittal.
Click Save when finished. The submittal is now part of the package you specified.