Wix 4 major update without uninstall, selected features only

[Trigve]

Hi,
I was searching how to implement updates but without uninstalling any installed programs. The posts I've found mostly suggest to use major update but sequence it so it only overwrite the old files. But I also need to update only specific "feature". For instance I've SQL server as a feature, app1 as another feature and so long. It isn't necessary to upgrade the SQL, only the app1 files. It is somehow possible?

Thanks