Let me explain a little about the idea..
Normally you have a clip in your database that contains text or an image.
The special sendkeys option allows you to create a clip that sends special characters to a target window WHEN IT IS PASTED INTO THAT WINDOW.
So, as per the example in the help file, if your clip text is:
{sendkeys}1111{TAB}2222{TAB}3333
Then when you attempt to paste this clip into a target application (via the quick paste menu for example), then it will try to send the keys to the target application as if you typed 1 then 1 then 1 then 1 then tab etc..
You can also use this {sendkeys} prefix for the quick formatting preset feature.
So if we take your request:
What I would like to do is send a shift + tab key combination followed by a copy command 4 times
It would probably be a clip (or a formatting preset) that looked something like:
{sendkeys}+{TAB}^C^C^C^C
that should send shift-tab followed by four Ctrl+C (copy) keys.
I'm getting this codes from the sendkeys help page in CHS help file.
The +{TAB} is a bit unusual, youd have to test that to make sure it works.. if that doesnt work you might try +({TAB})