You should use Challan ITNS No. 280 and tick the box 0021 Income-tax. As you are paying self assessment tax, you should further tick the Self Assessment Tax (300) under Type of Payment.
You should use Challan ITNS 280 and tick the tax 0020 Corporation Tax. As you are paying Advance tax for the Assessment year 2005-06, write this in the space provided in the challan and then tick the box Advance Tax (100) under Type of Payment.
You should use Challan ITNS No. 281 and tick tax '(0020) companies' as the status of the deductee is a company.
You will have to use two separate challans. You should use Challan No. 281 and tick box (0020) in respect of tax deducted at source from companies. You should use a separate Challan No. 281 and tick box (0021) in respect of tax deducted at source from non-companies.
As in both cases, tax deposited relates to TDS on 'Interest other than interest on securities', you should fill up code No. 94A in the 'Nature of Payment' field in the challan. The codes for 'Nature of Payment' are mentioned behind the challan.