MuseScore allows you to not only create and print a full score but also to generate individual player's parts from it.
A part can be created from a specific instrument staff in the main score or even from a specific voice within a staff. This allows you to display multiple parts (e.g. Flute 1 & 2) on a single staff in the score but to extract them as separate parts.
The most straightforward method is to create all parts at once. Parts are generated on a one-to-one basis from the corresponding Instruments in the score:
Click New Parts (MuseScore 3.2-3.3.4: Generate; prior to MuseScore 3.2: New All) (parts are named with the instrument name, and a number added to differentiate parts that have the same label in the main score).
The parts can now be accessed by clicking on tabs above the document window.
This method allows you to generate specific parts for only selected instruments (rather than all-at-once):
If you wish to create more parts, repeat steps 1 through 3 (above) for each part.
You have now finished setting up the parts. You do not need to do this again, unless you add or remove an instrument from your full score.
Once you have generated a part (or all parts), you can select any part at the top and use the controls at the bottom to control not only what instrument is in the part, but also which staves and voices within the instrument are included.
To add instruments to an existing part:
To remove instruments from an existing part:
To select the staves of an instrument to include in the part:
Note: If you select only voice 1 for a given staff, then only the content in voice 1 for that staff will be included in the part. Thus, in order to share flute 1 & 2 on the same staff, you will need to enter all notes onto both voices, even in passages where they share content. You also cannot enter the two parts as chords in the passages where they share rhythms.
This will generate files with the names "<title>" + "-" + "<part name>.<extension>". In addition, when exporting as PDF, this will also generate "<title>" + "-Score_And_Parts.pdf".
Parts and score are "linked", which means that any change to the content in one will affect the other, but changes to the layout will not. When you have the parts created, they are saved along with the score (if you open the score you have tabs for the score and every part you created).
However, if you wish to save a part individually: