If I am filing an amended return and I di not orginally file a home office...Can I

Can I file it now and claim it with my amened return?

If you qualify for the home office deduction, yes you can claim this cost on an ammended return.

If you are self employed, realize the home office deduction can not create a business loss, but can only reduce business profit.

See IRS Pub 587 Business Use of Your Home

thanks i will look at that