Is there any way to add part of the source segment and the appropriate target segment to my default translation memory?

Is there any way to add part of the source segment and the appropriate target segment to my default translation memory?

When click "ctrl" + "enter",  the whole source segment and the whole appropriate target segment can be added to  default translation memory. When it is required to add just part of the whole segmeng to default translation memory, how can I achieve it?
Is there any plugin can help or just a hotkey?

Appreciate for your help.

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