Try to Powershell:

Here is the PowerShell code snippet for creating Folders and Sub-Folders inside SharePoint List or Library:

if(!(Get-PSSnapin Microsoft.SharePoint.PowerShell -ErrorAction:SilentlyContinue)) 
{ 
    Add-PsSnapin Microsoft.SharePoint.PowerShell 
}
  
#Get the Web
$web=Get-SPWeb "https://sharepoint.company.com"
#Get the List/Library
$list=$web.Lists.TryGetList("SalesList")
 
If($list)  #Check If List exists!
{
    #Check Folder Doesn't exists in the Library!
    $folder = $list.ParentWeb.GetFolder($list.RootFolder.Url + "/" +"Sales List");
    #sharepoint powershell check if folder exists
    If($folder.Exists -eq $false)
    {
       #Create a Folder
       $folder = $list.AddItem([string]::Empty, [Microsoft.SharePoint.SPFileSystemObjectType]::Folder, "Sales Sub-Item")
       $folder.Update();
    }
    
    #Create a Sub-Folder "APAC Sales Documents" inside "Sales Documents"    
    $Subfolder = $list.ParentWeb.GetFolder($folder.URL + "/" + "APAC Sales Documents");
     
    #Check if sub-folder doesn't exist already
    If ($Subfolder.Exists -eq $false)
    {
       #Create a Sub-Folder Inside "Sales Documents"
       $Subfolder = $list.AddItem($folder.URL, [Microsoft.SharePoint.SPFileSystemObjectType]::Folder, "APAC Sales Documents")
       $Subfolder.Update();
    }
}

How about ensuring a nested folder structure in SharePoint Library? E.g. Library/FolderA/FolderAA/FolderAAA

#Get the Web
$web=Get-SPWeb "https://sharepoint.company.com"
 
#Get the List/Library
$list=$web.Lists.TryGetList("Documents")
 
#Function to Ensure FolderPath
Function Ensure-FolderPath($FolderPath)
{
    $SubFolders = $FolderPath -split "/"
    $RootFolder =  $SubFolders[0]
    $SubfolderPath = $RootFolder
 
    For($i =1; $i -le $SubFolders.count-1; $i++)
    {        
        $SubfolderPath = $SubfolderPath+"/"+$SubFolders[$i]
        $Folder = $Web.GetFolder($SubfolderPath)
 
        #Create Folder if it doesn't exists
        If($Folder.Exists -eq $false)
        {
            $TargetFolder = $Web.Folders.Add($SubfolderPath)
            Write-host "Folder Created:"$SubfolderPath
        }
    }
}