Objective: Convert different single part features with same attribute in a field (say 'Country') to a single multipart feature while retaining original geometries.
I have been looking for an ArcMap alternative of collect geometries tool available in QGIS 3.0+ but strangely enough, couldn't find it.
Closest match probably is dissolve tool which is identical to 'Collect Geometries' tool in QGIS as far as features (with same country name) are disjoint. For overlapping or adjacent features, it doesn't retain the original shapes and dissolve the shapes as well. I have also tried union and different other tools but no success.
I am open to ArcPy solutions as well. I hope that this image will help to understand the concept.