Previously we have migrated a site collection from on-perm 2013 to online. and we start using the migrated online site, but this online site have 10 sub-sites, which we have been using the on-premises versions, since they contain custom solution not support inside SharePoint online. now i want to migrate the data-only from on-premises to online? so is this possible using powershell? we have a migration tool but this migration tool only allow us to migrate a whole site, but in our case we have all the settings and the site collection already migrated, and we only want to migrate Data including list items and documents, without any other components. so can anyone advice on the available approaches we can follow?