You can work with multiple processing methods at the same time. The Method Selector lists all methods that are either linked to a data file or that you have manually loaded in the current Data Analysis session.
The Link symbol
indicates a link between data file and method:
When you click an injection in the injection tree, the symbol is shown in the Method Selector and indicates the method that is linked to the data file.
When you click a method in the Method Selector, the symbol is shown in the injection tree and indicates all injections that are linked to this method.
To reprocess a data file, you must link a method to it. This method will be used for the reprocessing. You can change the method by linking another method (see Link injections to a processing method).