Please note the following (from the AS)
" If an enterprise makes two or more investments in another enterprise at
different dates and eventually obtains control of the other enterprise, the
consolidated financial statements are presented only from the date on which
holding-subsidiary relationship comes in existence. "
From the above it is clear that consolidation should be prepared from the date on which holding subsidiary relatio ship comes.
And subsidiary relationship comes when a company holds more than 50% shares