Hi @sammi_ch,
If your source dataset already has the line feature that you want to create the buffer zone for, you should be able to pass it through the Bufferer (linear coordinate system - e.g. EPSG26910) or a GeographicBufferer (angular coordinate system - e.g. LL83). We have an awesome article for Buffering Features for Spatial Relation Analysis which should also be very helpful as it goes through the process of buffering and filtering.
Alternatively, if you need to build a line from a point dataset, you can first use the LineBuilder to create the line and then buffer, etc.