This work presents the results of a numerical and theoretical study on the cold-formed steel built-up sections under axial compression, to explore the buckling Behavior and ultimate capacity of built-up sections. The built-up sections have been formed by two identical lipped channels placed back to back connect by using spacers. The Finite element model is developed by using the ABAQUS software. The developed numerical model is verified against the experimental results published in the literature. After validation, the parametric study is conducted by varying the overall slenderness, depth, and number of spacers. The column strength obtained from numerical analysis are compared with the strength predicted by using the Direct Strength Method (DSM) and Effective Width Method (EWM) as per North American Specifications (AISI-S100:2007) for cold-formed steel members.