I hope it will help you, follow the tutorial for your analysis with EEG LAB.

Creating a STUDY

This part of the tutorial will demonstrate how to create an EEGLAB STUDY and perform simple plotting. An EEGLAB STUDY (or study) contains descriptions of and links to data contained in many epoched or continuous datasets, for example, a set of datasets from a group of subjects in one or more conditions of the same task or performing different tasks in the same or different sessions. We use a STUDY to manage and process data recorded from multiple subjects, sessions, and/or conditions of an experimental study.

https://eeglab.org/tutorials/10_Group_analysis/study_creation.html

https://eeglab.org/tutorials/10_Group_analysis/study_data_visualization_tools.html

https://eeglab.org/tutorials/10_Group_analysis/component_clustering_tools.html