SQL Server 2014 – How to add features to existing instance ? :-

1) Start installation center

2) Run Global Rule, You need to fix if any failure occur

3) Microsoft update option (Enable windows updates to search & install SQL updates as well)

4) Include product update with installation, (the latest available SQL Server product updates are displayed, when online)

5) Install Setup Files

6) Run installation rules, You need to fix if any failure occur

7) Select instance to add feature

8) Select features to install

9) Final cconfiguration

10) Installation in progress

11) Installation completed successfully

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Reference : Rohit Garg (http://mssqlfun.com/)