By default, when you activate any of the transformation tools (scale, rotate, or translate) from the Transform panel or using their hot keys, their corresponding local transformation parameters are automatically marked. To mark specific local transformation axes or global transformation parameters, however, there are some things you must do.
Let's say you're rotating only in Y in Local manipulation mode, and now you want to key only the Rotation Y parameter. When you look in the marked parameter list, you notice that all three rotation axes parameters (Ori.Euler) are marked, not just the one for Y. Why is this?
It's because the local manipulation mode does not refer to the local animation: it refers to the object transforming relative to its own center. Since there are no special parameters to key the effect of animating relative to the object's centre, the entire set of local transformations for the object is marked.
Choose Transform Automark Active Transform Axes on the Transform panel. Then when you click a transformation's specific axis button (such as the Rotation's Y button) on the Transform panel to manipulate an object, only that axis is marked, regardless of the current manipulation mode.
If you also choose Transform Display Global Coordinates in View Mode, the SRT text boxes in the Transform panel display global values when in View Reference mode and the global transformation parameters are marked in both View and Global mode.
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