How to apply filters in graph

Filtering option: Multiple Selection out of list: Temperature, SBP, DBP, MAP, Respiratory Rate,
Heart Rate, GCS.
Here Temperature, SBP, DBP, MAP, Respiratory Rate, Heart Rate, GCS are the fields for y axis and time is the field for x axis.
We are plotting the graph for the same. How to apply filter on these parameters. For example if, i need to filter out only Temperature, sbp and dbp parameters out of all the given fields above against time on x axis.
Any help regarding this topic will be appreciable.