Label in Trajaan allows you to categorise a set of keywords within the same group, according to their type (by brand, by product, by feature, by topic, etc.).
You can find the different ways of labelling here:
Combine tool: https://help.trajaan.io/en/articles/7887577-combine-tool
You can also add label manually, by selecting specific set of queries and name them by filling in the boxes in the desired column.