Tier 1 General extension ( Employement + Trading Account )

[smartofficer]

Hello Guys,
I am on Tier1 General Visa, Expiring end of june 2013. Actually I got my visa in 2011 on basis of Employement and Trading account , In which I shown My payslips, My Invoices, my Accountant statement and letters from HMRC and employers. I wait for 5 months for my extension, and I got it.
But now I am thinking to apply on window for extension, I am still doing employment and trading both together.
MY QUESTION IS : Can I apply on window for extension with all the documents, Like My invoices, statement of bank details, statement of accountant, statement of HMRC which shows my paid tax and my due taxes.
Because waiting for long is such a pain as its taking a long for extensions now a days.

Please Enlight me.
Thanking you;

[smartofficer]

Hello Guys,
I am on Tier1 General Visa, Expiring end of june 2013. Actually I got my visa in 2011 on basis of Employement and Trading account , In which I shown My payslips, My Invoices, my Accountant statement and letters from HMRC and employers. I wait for 5 months for my extension, and I got it.
But now I am thinking to apply on window for extension, I am still doing employment and trading both together.
MY QUESTION IS : Can I apply on window for extension with all the documents, Like My invoices, statement of bank details, statement of accountant, statement of HMRC which shows my paid tax and my due taxes.
Because waiting for long is such a pain as its taking a long for extensions now a days.

Please Enlight me.
Thanking you;