Your protagonist meets someone and begins a relationship while the main plot line is occurring. This is one of the most commonly used subplots as it is quite easy to weave into a film’s main plot.
All, however, should serve the main plot. The vehicle and type of a subplot can vary based on a film’s genre and plot structure. To start incorporating subplots into your film, it's important to first understand the types of subplots that exist by analyzing different subplot examples. To better understand the value of B plots, check out Lessons from the Screenplays analysis of how subplots are used to enhance the story of the film Hidden Figures. This can be done when a subplot challenges a character through a relationship, career choice, or reaction to a situation. Lastly, a B story can help reveal traits of a character that can help establish empathy with an audience. This can be a crucial plot device in providing context for the main plot line that moves the story forward. Some subplots often allow for various points of view and thus allow us to visually see different parts of the film’s world. Although the definition of subplot in literature is similar to how B plots operate in film, they differ in one specific way. The second value of a subplot is its ability to better establish the world of a film. While the actual action that occurs in a B story may be far from what is occurring in the main plot, they can both thematically resonate to strengthen the overall theme of a film.
The first way being they resonate the main plot’s overall theme.
So, what is a subplot good for? Although the subplot definition is very general, a B story can enhance a story’s main plot in many different ways. Subplot definition and uses The value of subplots