1)What is difference between hide & suppress ? Already answered.
2)What is difference between mate & align?
Already answered.... A more technical answer would be...
Mate: Positive side of a surface is in line with the Negative side of another surface
Align: The opposite... Positive with positive
3)What is difference between simple hole & standard hole ?
My proe is not open now.... Perhaps you are referring to a sketched hole...?
4)What is packaging in assembly?
Already answered above...
Further, the part will occur in BOM. However assembly cuts cannot be performed on a packaged component. A packaged component can be looked upon as a component placed on an assembly table, but yet to be assembled in its final positon.
5)Why to use bulk item in assembly?
There are items that we would like to be in BILL, but is not necessary to model as a component. e.g. being the quantity of paint required to paint an assembly or part. The quantity will depend on the surface area of the part. We would like this value to change as the surface area changes. Hence we create bulk components.... so as to include in BILL not need not MODEL.
6)What is bulk item & where it is used?
See above...
7)What is the application of merge from other models,cut out from other models,shrink wrap & copy geometry?
You may also refer to Pro/ENGINEER Forum: Cast and Mach comp with Inheritance feat.
8)What is skeleton model?
As the name suggests, a skeleton model prepares the FRAME WORK of our design intent. A good tutorial is available on Product Lifecycle Management (PLM) Software Solutions
A skeleton model is created in Assembly mode. You will need a licence for AAX to create or Edit skeleton models. However, you do not need AAX for using the same.
Skeleton models can comprise of Sketched entities, Datums, surfaces etc... to capture the Final Assembly design intent.
e.g. say you need to design a bicycle.... you can start with a sketch of TWO circles, defining the wheel dia and the wheel base. When you decide to change the wheel base, you change it in the skeleton model and all the other components related to the wheel base will accomodate the new wheel base. Skeleton model also facilitates Assembly family tables to get different configurations of the same design.