Only a data owner or the project owner has privileges to share
Data Sets. To share a Data Set, go to the Data Sets Browser in your
project, and right-click on the Data Set to be shared and then select
the Share DataSet option. A popup dialog will then prompt you to
select (1) a target project with which the Data Set is to be Shared
and whether the Data Set will be shared as read-only (Can View)
or as read-write (Can edit). To complete the sharing process, a
Data Owner in the target project has to click on the shared Data Set,
and then click on Acccept to complete the process.
Share dataset
Documentation