If you are using the Autonumber data type for all of your PK's you should not have a problem with multiple users adding records from a form.
If you want 10 forms that are very similar, you should use the copy paste method I mentioned. Then you can change the form to how you need it, for each copy of your original template form. There are other ways to use templates within Access but this is probably the best way for your application.
Having said that, I have to question why so many forms that are so similar in nature. Especially for such a simple DB. Typically these nuances are managed via VBA. Changing recordsets by adjusting a WHERE clause here and there is stuff that can be done on the fly.
Bottom line, you need to do what it takes to get the job done. If the VBA thing is getting the best of you, then using query and form templates may very well be the way to proceed.