When you are about to have a match, save the game. If you lose
your game, you can reload your saved game and try again. However, you
must remember your next fixtures date - once you are about to go to
the match it cannot be saved anymore.
Usually, to get a large amount of money in these games, all you
need to do is take over another team with the "Add Manager" option and
sell a player at a rather unrealistic amount. However, this results in
having no players remaining, no transfer budget at your chosen victim
club, or even worse, the board keeps intervening. The solution is to
take over the team you hate the most with the "Add Manager" option, as
usual. However, instead of selling a player to them, have them put in
a First Option bid for 100 million. Simply accept the bid and the 100
million is yours with no interference. No matter how deep in debt the
club gets, the owners will not stop the transfers, and you can reap
the rewards of unlimited money.