Merge all partition in CentOS

I've got a copy of CentOS VM from my company. However, the project folders under /home getting bigger and eventually the OS complain about lack of space for the /home partition. That is due to the partition for /home is small. I would like to merge those existing partitions to gain more spaces.

Here is the output of lsblk

NAME                        MAJ:MIN RM  SIZE RO TYPE MOUNTPOINT
sr0                          11:0    1 1024M  0 rom  
sda                           8:0    0   12G  0 disk 
├─sda1                        8:1    0  500M  0 part /boot
├─sda2                        8:2    0  7.5G  0 part 
│ ├─vg_was85-lv_root (dm-0) 253:0    0  9.5G  0 lvm  /
│ └─vg_was85-lv_swap (dm-1) 253:1    0    2G  0 lvm  [SWAP]
└─sda3                        8:3    0    4G  0 part 
  └─vg_was85-lv_root (dm-0) 253:0    0  9.5G  0 lvm  /
sdb                           8:16   0   40G  0 disk 
├─vg_data-lv_opt (dm-2)     253:2    0   30G  0 lvm  /opt
└─vg_data-lv_var_ibm (dm-3) 253:3    0   10G  0 lvm  /var/ibm
sdc                           8:32   0   15G  0 disk 
└─vg_data-lv_home (dm-4)    253:4    0   15G  0 lvm  /home

Here is the output of df -h

Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_was85-lv_root
                      9.4G  3.0G  6.0G  33% /
tmpfs                 1.9G  236K  1.9G   1% /dev/shm
/dev/mapper/vg_data-lv_opt
                       30G   20G  8.8G  69% /opt
/dev/mapper/vg_data-lv_var_ibm
                      9.9G  151M  9.2G   2% /var/ibm
/dev/mapper/vg_data-lv_home
                      9.9G  7.5G  1.9G  80% /home
/dev/sda1             485M   56M  404M  13% /boot

I want to merge all the partitions into one to gain more spaces. Is it possible?

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