**I. Detachable= can be disassembled and assembled.**

OP's query 
>The context is like: “This table from IKEA comes in parts and thus ‘assembly-able’”
Meaning it can be assembled and disassembled. .

The right word is **detachable.**.    
**"Detachable"** implies that parts or components can be easily removed and reattached, which fits well with the idea of assembly and disassembly.

**II. Dictionary meaning.**.   
*Ref. Collins dictionary.*
>detachable.         
adjective.         
If a part of an object is detachable, it has been made so that it can be removed from the object.      
...a cake tin with a detachable base.
Examples :       
*The clear lenses are detachable and the frames washable.     
The Guardian (2017)*.    
.
*There's a car with a detachable motorcycle stored inside it.       
The Guardian (2018)*

**III. Detachable is a versatile adjective.**

For furniture:     
-"The detachable legs make it easy to move and store the table."

For hydraulic systems:      
-"The detachable hose allows for easy maintenance and replacement."

In general, "detachable" is a versatile adjective that can be applied to various contexts where parts or components can be separated or disconnected, including:    
-Furniture (legs, shelves, etc.).     
-Mechanical systems (hoses, pipes, etc.).   
-Electrical systems (connectors, cables, etc.).      
-Industrial equipment (modules, components, etc.)

**Ref. Alamy Detachable Laptop:**
>[![enter image description here][1]][1]

,**Ref.Alibaba.com**
>[![enter image description here][2]][2]


  [1]: https://i.sstatic.net/eA0ekXlv.jpg
  [2]: https://i.sstatic.net/YLApsax7.jpg