Specifying TMs for all language pairs (general rule)
As a general rule, you select your TMs at the All Language Pairs level, which means that the selected TMs apply to all the language pairs they contain. However, you can also specify TMs at an individual language pair level, as an exception.
About this task
Use individual language pairs only if you want to have different TM selections, a different TM order or different lookup, or update and concordance settings for an individual language pair.
Here is an example which points out the difference between specifying TMs at all language pair level or at individual language pair level. Suppose you add a multilingual translation memory at the All Language Pairs level that contains English to German and English to French language pairs. However, you do not want to use this translation memory for English to French and instead want to select another translation memory. To do that, select the translation memory that you want to use at the individual language pair settings instead of the All Language Pairs level.