I think I Did a dumbest mistake as my subscription will be ending  soon and my employer will not renew it so i will be stuck in SW 2018 SP0.1 ( Hopefully SW 2018 SP1 and SW 2017 SP5 will be available before December ends) I wipe out the solidworks in my mobile workstation then install fresh the SW 2018 SP0.1 and after i set up my preference then open an assembly and create parts after this i realize i made a mistake by wiping the SW 2017 SP4.1 on my machine because of this,

If i point my mouse in the SW icon in the taskbar it will only show the current parts but the assembly is missing in 2017 parts and assembly will show. Also Sketch from Asembly environment cannot be copied in a parts.