【PLM之家NX10.0建模新功能】3.6 表达式组
【PLM之家NX10.0建模新功能】3.6表达式组Expression groups：
使用表达式组功能，创建一个有级别的树形的表达式组，而不是以前的平齐模式
Only one group is active at a time. Newly created expressions are added to the active group.
When groups are first enabled, the Default Group is active and any existing or newly created expressions reside there.
Expression groups can contain expressions and nested expression groups.
Group names must be unique to the part.
Expressions can only belong to one group at a time. Drag expressions from one group to another.
Expressions displayed outside of the Expressions dialog box do not contain any group information.
When merging parts, if the source part contains expression groups other than the Default Group, those expressions, when transferred from the source part, retain their original group assignments in a new top level group that uses the source part file name as the folder name. Source groups are nested inside.
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