Once you’ve imported your .CSV once in the Web Vault, all the vault data should be automatically synced to all of your devices and Bitwarden client apps (as soon as you log in on each app).
I helped you get rid of your duplicates two weeks ago in your previous thread. If you’re again seeing a “huge number of duplicates”, that means you are creating the duplicates somehow. Have you been reimporting the .CSV file multiple times? Are you using the “Ask to Add Login” option, and if so, are you saving new logins in Bitwarden while your vault is still locked?
The only way to get rid of duplicates (other than deleting them manually) is a process similar to what we did last time, which involves exporting your passwords and de-duplicating them in Excel, then purging your vault contents and re-importing the de-duplicated export file.
However, there is little point in doing so if you don’t stop whatever you’re doing to create the duplicates to begin with. Otherwise you’ll just end up with a “huge number of duplicates” again in another two weeks.