Which command is used to remove a component from an assembly and add another existing component in its place?

The command used to remove a component from an assembly and add another existing component in its place is the Replace Component command. This command is specifically designed to facilitate the seamless substitution of one component for another within an assembly structure.

When using the Replace Component command, you initiate the process by selecting the component you wish to remove. Following this, you can choose an alternative component from the existing library or assembly. This is particularly useful in scenarios where you need to upgrade, modify, or correct components without having to manually delete and reinsert them into the assembly.

The operation retains the assembly relationships and features that may be associated with the original component, thereby conserving the assembly's integrity and structure. This ensures that any constraints or references tied to the original component are preserved, which is critical in maintaining design accuracy throughout the assembly.

In contrast, options like Reload Component or Swap Component do not perform the same function; they are generally aimed at updating components or interchanging parts without the ability to replace them completely with another existing component. Therefore, the Replace Component command is the best choice for making direct substitutions in an assembly.