Do you want to install all the features in all the clients and some of them you installed with only antivirus and antispyware and you want to install all features in all the clients?
For the computers which is already installed with SEP
In the SEPM click the Admin button on the left.
Click Install Packages on the bottom.
Click Client Install Feature Set on the top.
If a feature set doesn't exist that meets your needs, then choose Add Client Install Feature Set.
Give the feature set a unique name.
Select only the features you need (Antivirus/Antispyware, Network Threat Protection, Proactive Threat Protection).
Choose OK.
Still within the SEPM, click the Clients button on the left.
Select the group with your SEP clients in it and then click the Install Packages tab in the right pane.
Under Tasks, choose Add Client Install Package.
In that screen, uncheck the box next to "Maintain existing client features when updating".
Below that, select the feature set you want to use from the dropdown menu.
If you don't choose Upgrade Schedule, then clients will just pick up the instructions to change their installation as they begin to check in, which will launch MSIEXEC on the SEP client.
For new computers which you want to install SEP
Create a package with all features and deploy with the help of that
Below doc can help you in this
Creating custom Client Installation packages in the Symantec Endpoint Protection Manager Console