It depends on what's required from files and database tables point of view. Please explore case studies first.

Sorry, we don't provide such service. A frontend developer is required.

If all sites use same tables, it's only required to update extensions on master site.

If each site uses own tables, an extension is updated on each site. There can be issues with updating an extension if it doesn't use native Joomla installer.

... phpBB installation. Any ideas on how I could make this work. phpBB is not robust enough to handle the combined number of categories and forums required for the five subdomains. I tried to do it and its performance slows to a crawl. vBulletin is the only board I know of that could handle that ...

... to date. Just a few questions before I purchase it. I read through the requirements and saw this: Small patch for RocketTheme phpBB styles can be required. Is this script included with the extension or do you provide it? And is this a fairly trivial task to get these working together and still ...

⋅  WARNING! Custom report layouts of previous versions are incompatible! Simple code changes are required. ⋅ Feature: new layout 'default_norows' with"No results found." message allows to customize message if no results were found. ⋅ Fix: ...

... in CLI command line. ⋅ Feature: ability to override default YooTheme template style/profile for sites sharing same files. Warp 6+ is required. ⋅ Feature: experimental Falang compatibility (Falang 2.2.2 is required) - new setting in Advanced site settings. ⋅ Feature: ability ...

Virtuemart does not support multi-tenancy.

It's only possible to load its database tables from other site. So 2 sites can have same VM database data, sharing of all Joomla users is additionally required.

Actually only 2 columns are required: Title (plane text) and Description (HTML).

It's impossible to specify synonyms or tags in CSV.

Please create a ticket in Support Center, support techs help with importing from CSV file.

... I get this alert: "Updater: : Extension: Could not open" And this error msg: "Update invalid" and "Manual update is required", and that I could find more in the Customer area--supposedly at Alterbrains. But there is no info, as far as I can see. Strangely, I ...