When you edit or delete a component definition, it influences all component instances present in the active network that are based on that definition.
Please check the number of instances corresponding to the component definition, exist in your network documentation, before making any changes.
Instances are real network objects which you display and document in Pathfinder and which are always based on a component definition.
You can manage the component instances by clicking on the ”…” button in the number of instances field.