How to print Item Description Side by side ?

Yes. It's working fine even for unique batches where default qty is one

Code:

[#Part: EXPINV BatchDetails]
Option : EIBatchExplosion0 : not $$InPrintMode
Option : EIBatchExplosion1 : $$InPrintMode

[!Part    :    EIBatchExplosion0]
                Line    : EXPINV BatchDetails
                Repeat  : EXPINV BatchDetails : Batch Allocations
                Option  : Small Size Part

[!Part    :    EIBatchExplosion1]
Line : EI BatchExplosion1

[Line: EI BatchExplosion1]
Fields : EI Batch1

[Field: EI Batch1]
Use                 :     Narration Field
Alignment    :     Left
Width             :     7 cms
Indent            :    1 cms
Style             :     Small Italic
Info                 :     $$FullList:BatchAllocations:$BatchName
Lines                :    0

Thanks.