To create a part instance, select Instance
Create from the main menu bar and select the parts to instance from the Create Instance dialog box that appears. You can select from any of the existing parts in the current model. You can create multiple instances of the same part, but you cannot assemble instances of parts that were created in different modeling spaces (three-dimensional, two-dimensional, or axisymmetric).
When you create the first part instance, the Assembly module displays a graphic symbol indicating the origin and orientation of the assembly's global coordinate system. This symbol is a datum coordinate system. If desired, you can hide it using the assembly display options; for more information, see “Controlling datum display,” Section 50.6.
By default, ABAQUS/CAE creates a dependent part instance. A dependent instance is only a pointer to the geometry of the original part. As a result, many operations are not allowed on a dependent part instance; for example, you cannot add partitions, create virtual topology, or mesh the instance. In contrast, an independent part instance is a copy of the geometry of the original part. You can perform most operations on an independent instance; for example, you can add partitions, create virtual topology, and mesh the instance. You cannot create both an independent and a dependent instance of the same part. You can select the instance from the Model Tree and change it from independent to dependent or vice versa. For more information, see “What is the difference between a dependent and an independent part instance?,” Section 13.3.2.
When you create an instance of a part, by default ABAQUS/CAE positions the instance so that the origin of the original geometry aligns with the origin of the assembly coordinate system. When you create multiple part instances, a new instance can be positioned over an existing instance. However, if you toggle on Auto-offset from other instances in the Create Instance dialog box, ABAQUS/CAE translates each new part instance along the X–axis until it does not overlap any existing part instances. If the assembly is axisymmetric, ABAQUS/CAE translates the new part instance along the axis of revolution instead of along the X–axis.
To create a part instance:
From the main menu bar, select InstanceCreate to create a part instance from the parts in the model.
ABAQUS/CAE displays the Create Instance dialog box and a list of all the existing parts in the model.
Tip:
You can also create a part instance using the 
tool from the Assembly module toolbox. For a diagram of the tools in the Assembly toolbox, see “Using the Assembly module toolbox,” Section 13.8.
From the list of parts, select the parts to instance. You can use a combination of [Ctrl]+Click and [Shift]+Click to select multiple parts.
A temporary image of the selected part instances appears in the current viewport. ABAQUS/CAE positions the temporary images so that their origins coincide with the origin of the global coordinate system.
By default, ABAQUS/CAE creates a Dependent part instance. If desired, toggle on Independent to create an independent part instance.
If desired, toggle on Auto-offset from other instances to offset the new part instances.
If you are satisfied that you have selected the correct part instances, click Apply from the Create Instance dialog box.
ABAQUS/CAE creates the part instances and applies an auto-offset if selected.
To create additional part instances, repeat this procedure from Step 2. When you have finished creating part instances, click Cancel to close the Create Instance dialog box.
