From BlenderWiki

Meta Editing

Well, truly speaking, editing Meta objects amounts to moving/scaling/rotating them (along with the other advanced transformations), and adjusting their various properties we saw in the previous page (underlying structure, threshold, stiffness…). So this page is going to be quite short!

There is one thing important to understand when editing metas: they form a “unit”, i.e. unlike meshes or curves/surfaces, you do not have multiple small points to control a meta, you always work on it as a whole.

Basic Meta Editing (translation, rotation, scale)

Once you have a selection of one or more metas, you can grab/move (G), rotate (R) or scale (S) them, like many other things in Blender, as described in the Manipulation in 3D Space section.

Note however that scaling has two specificities with metas:

• First, when you have the green circle selected, you do not scale the meta, but modify its stiffness, as we saw in the previous page.
• Second, metas do not really have a “scale”, but rather a “radius”. This is only one setting, so you cannot scale a meta along a given axis (in Edit mode – in Object mode, it works as usual!). You can also see this in the Transform Properties panel: you just have a Radius field.

Advanced Transform Tools

The To Sphere, Shear, Wrap and Push/Pull transform tools are described in the Manipulation in 3D chapter.

Duplication

Well, this command just duplicates the selected metas. The copy is selected and placed in Grab mode, so you can move it to another place.

Deleting Elements

There is no Erase menu for metas, just a confirmation pop-up asking you if you want to delete the selected metas. Clear and simple!

Conversion

You can only convert metas to meshes, but here you have the option to keep the original Meta object (i.e. create a new Mesh one, instead of a “real” conversion…). Note that the resolution used for the new mesh is the Wiresize one, not the Rendersize one.

Misc Editing

You do not have much of the options of meshes, or Object mode. You cannot separate a given meta, neither make other selected objects children of one or three metas, nor add hooks to control some metas with other objects.

However, the Mirror tool is available, behaving exactly as with mesh vertices, as well as the snap commands.