@Steven_Kramer Welcome to the forum!
You can certainly store the password in a regular login item in stored in your Bitwarden vault, but you cannot (yet) do “auto-typing” (whereby Bitwarden automatically transfers the password into the password input filed in your Quicken app). Instead, you’d have to either copy-and-paste the password, or (if Quicken supports it), drag-and-drop the password from the password field in the Bitwarden Desktop app into the password input field in Quicken. Drag-and-drop is a more secure method, so you should use it over copy-and-paste whenever possible.
However, if you read through some of the later comments in the auto-type feature request, you will find that Bitwarden has plans to implement this, and that there is currently an alternative desktop app available that can already do this.