In many cases, the committees are tasked with preparing recommendations that respond to the government proposals, and then there is a vote on them on the floor of the House.
If you take, for example, the Swedish Parliament or the German Parliament, the finance committee—or the budget committee in the German case—makes many amendments every year, which are proposed to the House. When they come out of the committee, they are very rarely changed on the floor of the House. They represent a view that is usually accepted on the floor of the House.
Of course, the government usually is not against these amendments, or it allows them to happen. But it is also possible for the opposition to sometimes influence particular items. In many parliaments, you have some scope for cross-partisan cooperation.
Again, if it is possible, it's possible at committee level. I'm aware that the Westminster type of set-up tends to be extremely partisan, but if this space exists, it is at the committee level. It's even more important that the space not be diminished, for example, by the deemed rule or lack of time or things like that.