To can send work to another Studio user for translation or review you create project packages in an offline workflow.
Project packages are created using the Create Project Package wizard. You can launch the wizard from the Files and Projects views in SDL Trados Studio by selecting Home tab > Packages group > 
Create Project Package. You can also select files that you want to include in the package in the Files view and right-click and select Create Project Package from the shortcut menu. Once the project package is created, you send it to translators, proofreaders or other team members.
You can create a single project package for all files in a selected project or for a selected set of files. You can also split a package into several packages based on target language and size.
If you are working with project translation memories:
If you create a project package containing all files in your project, the entire file-based project translation memory can be included in the package.
If you create a project package for a selected set of files, you can choose to include a subset of the project translation memory, containing the information relevant to those files only.
If your project has a server-based translation memory, this reference to the project translation memory on SDL TM Server is automatically included in the package for you to be able to connect to the server-based translation memory.
A project package can also include the project file-based main translation memories and termbases, references to the server-based translation memories and termbases, and AutoSuggest dictionaries.
During package creation, the batch tasks Word count and Analyze files are performed. These tasks are performed when the Recompute word count and analysis statistics in order to update cross-file repetition counts option is selected in the Create Project Package wizard. This option is selected by default. These tasks produce figures relevant to the files included in each package. It also generates and includes the Analyze Files and Word Count reports in the package.
For a detailed analysis of how Studio calculates the number of words in a file, see the blog article So how many words do you think it is?.