Both houses of congress are organized by committees, each with its own sphere of influence. With few exceptions, the work of any one committee, say, the Intelligence Committee, neither hinders nor helps the work of another with respect to drafting bills, holding hearings, etc.

Here's how Congress works, in broad strokes: the aforementioned committees hold hearings (sometimes public, sometimes not) and meetings to draft and review bills and resolutions their staffers actually write (usually with considerable "help" from lobbyists). Then they vote on whether to move these items out to a vote in the larger body, where the leader (Speaker or President Pro Temp) has substantial power to move the item forward in the process or squash it completely.

The suggestion that Impeachment is a "distraction" because it takes focus away from other work of Congress is one of Trump's and his defenders' favorite lines, but it's also seen elsewhere in the wild, so to speak. It's equally false in all cases. Some consider it a distraction from these important issues, for example:

* Medicare for All
* (Other) Corruption in our government
* Foreign Policy that hurts America (broad bucket here: interventionism, military aid and direct combat assistance, etc., are all included)

Anyone who believes the impeachment hearings and process, in and of itself, is a distraction from these things, should consider the following instead: of the hundreds of candidates for federal office this season, approximately three are speaking about any one of these issues, and I can't think of a single one that is serious about addressing all of them. The few that are talking about these things seriously have got little chance of winning their elections, in part because of the second item in the list.

The reason these items aren't getting traction in our Congress isn't because they're busy playing political games with impeachment, and trying to distract from these issues: it's because fundamentally, America's government is broken and, roughly speaking, about half of its citizens don't want M4A (depending on how it's asked), don't care about (or, more often, simply don't understand) corruption, and actually think our FP is good. These issues aren't moving in Congress because not enough (almost none) care about them, and that's partly because they have to be made to care, and we (collectively) have been unsuccessful at doing that.