P85 number of P45s

Hi Forum, I am about to leave UK and I am starting to look into the P85 online form. As the leaving date is not yet there (one month left), the online form does not allow me to be completed. It is said to be completed after departure date. Basically, I have more than one P45 to enclose with the P85 form (I actually I will end up to have 4No of P45s for taxed payments received in this last period). I was advised by HMRC on the phone that I should enclose all of them, I would like to ask you: would the P85 online form allow the uploading of the above number of P45s? If not, please do you know on how can I get around the issue? thank you in advance for your help.

Hi Maurizio Coglia,
We would only need your most recent P45, as your other employer will usually send confirmation of your final earnings shortly after you leave.
The P85 online form will only accept one P45.
If you would still like to send all of your P45s, download and send a postal P85, with your documents included.
Get your Income Tax right if you're leaving the UK (P85).
Thank you