I have been using e.g.
Me.WpdllInt1.Memo.wpaProcess("Open", "")to create a custom menu and the wpa action names are in a huge list - nice to have a choice but hard to find so here is an alphabetical list which I found helpful. Reserved and internally used entries removed.
AutoWidthCol
BAllOff
BAllOn
BBottom
bgcolor
BInner
BLeft
Bold
BOuter
BRight
BTop
Bullets
Center
Close
color
CombineTables
Copy
CopyAttr
CreateTable
Cut
DecIndent
DelCol
DeleteAllFields
DeleteEmptyLines
DeleteText
DeleteTrailingSpace
DelRow
DiaBullet
DiaBulletOutlines
DiaExportToPDF
DiaFind
DiaINSBookmark
DiaINSGRAPHIC
DiaINSGRAPHICLINK
DiaINSHyperlink
DiaINSSymbol
DiaINSTable
DiaMessageBox
DiaOneStyle
DiaOPEN
DiaPageProp
DiaParagraphBorder
DiaParagraphProp
DiaPreview
DiaPrint
DiaPrinterSetup
DiaReplace
DiaSAVE
DiaSAVEAS
DiaSectionProp
DiaSpellcheck
DiaSpellOptions
DiaStyleSheet
DiaTabstops
DiaWPAbout
DiaWPDebug
EditHyperlink
Exit
FindNext
FitHeight
FitWidth
font
fontbgcolor
FontBKColorSelection
fontcolor
FontColorSelection
FontSelection
fontsize
FontSizeSelection
FormatDontBreakTableRows
FormatDontBreakTables
FormatForScreen
FormatIgnoreKeepNInformation
FormatOrphanWidowControl
FormatUseHyphenation
Goto_BodyText
Goto_BOOKMARK
Goto_CPPOS
Goto_FIELD
Goto_Footnotes
Goto_HYPERLINK
Goto_LINE
Goto_MoveSel
Goto_Page
Goto_PARAGRAPH
Goto_TABLE
GraphicAsChar
GraphicAutoWrap
GraphicBothWrap
GraphicNoFrame
GraphicNoWrap
GraphicRelToPage
GraphicRelToPar
GraphicSingleFrame
GraphicUnderText
GraphicWideFrame
Hidden
HideSelection
IncIndent
InsCol
InsColBefore
InsertDATE
InsertDocField
InsertField
InsertField
InsertFootnote
InsertIniField
InsertNumber
InsertText
InsertTextBox
InsertTextCalcField
InsertTextField
InsertTextFieldDATE
InsertTextFieldNEXTPAGE
InsertTextFieldNUMPAGES
InsertTextFieldPAGE
InsertTextFieldPRIORPAGE
InsertTextFieldSECTIONPAGES
InsertTextFieldTIME
InsertTIME
InsertToc
InsRow
InsRowBefore
IsHeadline
IsOutline
Italic
Justified
Left
MergeAllTexts
MergeBodyText
MoveFirst
MoveLast
MoveNext
MovePrior
MoveSel_BOOKMARK
MoveSel_FIELD
MoveSel_FOOTERS
MoveSel_FOOTNOTE
MoveSel_HEADERS
MoveSel_HYPERLINK
MoveSel_IMAGE
MoveSel_LASTSEARCH
MoveSel_PAGE
MoveSel_PAGEBREAK
MoveSel_SECTION
MoveSel_TABLE
New
NewFooter
NewHeader
NextPage
Norm
NormalizeText
Numbers
Open
OutlineDown
OutlineUp
parcolor
ParColorSelection
ParKeep
ParProtect
ParStyleSelection
Paste
PasteAttr
Print
PrintDialog
PrinterSetup
PriorPage
Protected
Redo
ReformatAll
Replace
Right
Save
Search
SelAll
SelectColumn
SelectLanguage
SelectRow
ShowAddressArea
ShowBackgroundImage
ShowBookmarks
ShowCR
ShowFields
ShowFieldsEx
ShowFoldLine
ShowFormulas
ShowGutter
ShowHiddenText
ShowHRuler
ShowHyperlinks
ShowInvalidateAllPages
ShowInvalidateLastPage
ShowPageMargins
ShowSPANCodes
ShowTableGrid
ShowVRuler
ShowWatermark
size
SortRows
SpellAsYouGo
Spellcheck
SplitCells
SplitTable
Strikeout
style
Subscript
Superscript
Underline
Undo
UpdateToc
zoom100
zoomdoublepage
zoomfullpage
ZoomIn
ZoomOut
zoomThumbnails
zoomwidth