How to increase home using another partition?

Question

linux

In connection with the upgrade, I had to reinstall Ubuntu.
Previously, there were four partitions for it, which were mounted during installation of the system as

• SWAP
  
• / (root)
  
• /home
  
• /var/www
  

During reinstallation, I forgot to specify to mount the home directory from a separate hard disk partition. Accordingly, it is now stored in the root partition.
Is it possible now to somehow mount the forgotten partition to the home directory in such a way that it does not appear as a separate partition in nautilus?
Reluctance to reinstall the system, fiddling with gparted, combining two partitions into one - too. Adepts of Linux, tell me what is the solution?

Answer 1

man fstab

Answer 2

hm. lvm allows you to do this more smoothly.
and so - at one time I had a typical installation of ubunta, I noticed how many large partitions needed with installed sneakers / gnome / or servers, these numbers were multiplied by 2, the rest under [/ home | / var], etc. large sections were given if it is a web or database server.
well, for example, create a partition and mount it as /home/$user$/[video|music]