A more thorough explanation:

Substitute in

When a new lawyer takes over a case from another lawyer, they must file a written statement with the court to confirm the change.

1. After working on the case for several months, the original lawyer had to leave for personal reasons. Another lawyer was hired to substitute in and take over the case.

2. The defendant's lawyer was not able to attend the trial, so a substitute lawyer was brought in to represent the defendant.

These examples illustrate how a new lawyer can take over a case from another lawyer by filing a written statement with the court. This process is called "substituting in." It ensures that the court and all parties involved are aware of the change in representation.