Union Government
An appeal lies to the Supreme Court from a High Court's civil judgment, decree or final order if the High Court certifies under Article 134A that the case involves a substantial question of law of general importance which, in the High Court's opinion, needs Supreme Court determination. No appeal lies from a single Judge's High Court decision unless Parliament provides otherwise.
For civil (non-criminal) cases, a further appeal to the Supreme Court beyond the High Court generally requires the High Court itself to certify that the case raises a genuinely important legal question deserving the Supreme Court's attention - it isn't an automatic right to a further appeal.
A major civil dispute over property or contract law that a High Court decides can only reach the Supreme Court on appeal if the High Court agrees the case raises a broader legal question of general importance, not simply because one side is unhappy with the outcome.