TMS (Template Modification System" is a tool for making modifications to existing templates.
Lets say you have a vbulletin template which had the following line in it:
HTML Code:
<div>This is the title!</div>
and you wanted to modify this template so that the phrase "This is the title!" was bolded.
You could simple edit the template and add appropriate tags, and viola - it would be done. However, a future version of vbulletin may update that template and then you would need to re-apply the edits.
Using TMS, you can 'Search for Text'
<div>This is the title!</div> and choose to 'Replace with Text'
<div><strong>This is the title!</strong></div>
and TMS will edit your template for you.
If a future release of vBulletin modifies that template, your edit will remain - if it modifies the section of teh template you have edited, you will be alerted to this and will then be able to easily update your TMS edits.
I have a heavily customised site based on the default style -
ALL of it is done with TMS - my last upgrade required
zero additional effort other than uploading files and running the upgrade script.
Learn how to use it - you'll be glad you did!