It's possible to add new protein assignments and delta masses to an Intact project after it's been created.
To add a new reference mass:
1. Open the Sample-proteins table in the Edit menu:
2. Select Add custom column and provide a name, select column type Mass and add a value:
The new assignment will be made across all samples.
To add new delta mass (e.g. modification), open the Delta masses table in the Edit menu:
Add a row to the end of the table and type in the delta mass and name:
Set the tolerance wide enough to allow for variations between samples.