Make all your changes to the back end.
Modifications to existing tables will show up automagically.
To add a new table, opent the databse window (F11 if its enabled)
rightClick & choose Link tables . Follow the bouncing ball.
Its a little harder, but quite do-able if you need to do it
programmatically. Create a new tableDef, & set its connection property
appropriately. Its been a long time since I've done this, so I'm hazy
on the detail, but it is quite feasible to check if the new table
exists in the back end on start up. If it doesn't, create it, then
link to it all in code.You can likewise make all your design mods the
same way. This will save you going round doing each machine
individually. It is a lot of work however, and I would only do it if
it was difficult to visit each machine. It does have the advantage
that all the changes are guaranteed to be identical
HTH