The deleting of sheets is quite easy as i recall, you can probably just google search the line you need. The multiple charts in a PDF thing is a bit more tricky, but if it is the case as I am currently guessing that you have test1, test2 and test3 as chart sheets in your workbook you can use the following code to join all together in a single PDF.
ActiveWorkbook.Sheets(Array("test1", "test2", "test3")).Select
ActiveSheet.ExportAsFixedFormat _
Type:=xlTypePDF, _
Filename:="All Charts.pdf", _
Quality:=xlQualityStandard, _
IncludeDocProperties:=True, _
IgnorePrintAreas:=False, _
OpenAfterPublish:=True